Blue Cave Biševo – A Guide to Visiting the Adriatic's Most Famous Sea Cave
Blue Cave on the island of Biševo is one of the most renowned natural sites of the Croatian Adriatic. It is located in a small bay called Balun on the eastern side of Biševo, approximately 4.5 nautical miles or 8.3 kilometres from Komiža, and is famous for its unusual light effect that transforms the cave's interior into a space filled with intense blue light during certain parts of the day.
Photographs may appear almost surreal, but the colour in the cave is not a result of artificial lighting or post-processing effects. When the sun and sea are in the right position, light enters through an underwater opening beneath the surface, reflects off the bright seabed, and illuminates the entire interior from the sea.
The water then takes on a deep blue hue, while objects submerged beneath the surface acquire a silvery sheen.
For this reason, the Blue Cave is not a place that looks the same at all times of the day. The time of arrival, the sun's position, wave conditions, and cloud cover can completely alter the experience.
Where is the Blue Cave located?
The Blue Cave is situated on the eastern coast of Biševo, in Balun Bay.
Biševo lies southwest of Vis, directly opposite Komiža. Komiža is the most natural starting point for visiting the cave, as it is only a few nautical miles away from Biševo.
The cave administratively and geographically belongs to Biševo, making the name Blue Cave Biševo more accurate than the commonly used term "Blue Cave Vis".
However, many visitors search for it online as Blue Cave Vis or Blue Cave Croatia, as Vis is the main larger island from which access is gained.
Why is the Blue Cave blue?
The most interesting part of the story about the Blue Cave is actually found beneath the sea surface.
On the southern part of the cave, there is a large underwater opening. Sunlight penetrates through the water and falls onto the light, yellowish sandy bottom.
The seabed reflects a significant amount of light upwards towards the cave walls. Since the light passes through the seawater beforehand, the interior takes on a characteristic intense blue colour.
Objects submerged in the water, such as paddles, ropes, or parts of boats, appear almost silver due to this reflected light.
It is important to note that this phenomenon is not merely the result of a small beam of light. The large area of the bright seabed acts like a natural reflector, illuminating the entire chamber from below.
Therefore, upon entering from the bright Dalmatian sun into the dark passage, one may initially see almost nothing for a few moments, before the blue interior of the cave unfolds before their eyes.
When is the best time to visit the Blue Cave?
If the goal is to see the most pronounced blue-silver light effect, it is best to arrive when the sun is high enough to illuminate the underwater opening.
Local official sources indicate that the best period is approximately between 10 am and 2 pm, depending on the time of year.
In practice, late morning and around noon are the most sought-after times.
However, there is one important consideration: the best light and the least crowding do not occur at the same time.
In July and August, the largest number of excursion boats gathers in front of the cave around the best lighting period. If visiting during peak season, one should be prepared to wait before boarding the small boat that enters the cave.
If the best possible colour is desired, it makes sense to accept the larger crowds.
If a quieter experience is more important, an earlier visit may be more pleasant, although the blue effect may not be as strong.
A sunny day is more important than many think
The Blue Cave is beautiful even when the lighting conditions are not perfect, but cloudy weather significantly reduces the intensity of the blue colour.
For the true effect, sufficient direct sunlight is necessary.
Therefore, it is not enough to simply book a time slot at 11 am or 12 pm. The most beautiful visit occurs when the following align:
a sunny day, calm sea, and a good position of the sun.
If staying on Biševo for several days or if the excursion can be flexibly adjusted, it is worth checking the forecast and choosing a brighter day.
The sea determines whether the cave will be open
This is one of the most important things to know before planning an excursion.
The entrance through which tourist boats enter the Blue Cave is only about 1.5 metres high and approximately 2.4 metres wide.
As a result, even relatively small waves can make entry unsafe.
It may happen that it is a sunny day in Komiža, yet the Blue Cave may still be closed due to sea conditions.
The open sea between Vis and Biševo and the waves at the cave's entrance are more critical than whether it is raining or sunny.
Therefore, when visiting, one should not plan the rest of the day as if entry is guaranteed. If the sea is rough, the concessionaire will simply not allow entry.
The wisest course of action is to check the cave's status on the same morning, especially after strong winds, southerly winds, or periods of rough seas.
What does a visit to the Blue Cave actually look like?
A large excursion boat, speedboat, or private boat does not enter the Blue Cave directly.
The standard visit is organised via the bay Mezuporat on Biševo.
There, visitors disembark or transfer to small boats operated by local boatmen. These boats are low enough to pass through the very small sea entrance of the cave.
The ride from Mezuporat to the cave is short.
When the boat reaches the entrance, the boatman waits for the right moment between waves, and passengers remain seated in the boat. Due to the low stone arch, it is often necessary to lower one's head and remain completely inside the boat.
After a few metres of dark passage, the main chamber opens up.
The entire organised tour from departure at Mezuporat to return takes approximately 20 minutes, while the actual time spent inside the cave is relatively short.
This is good to know in advance. The Blue Cave is not a place where one strolls for an hour. The experience is brief but very specific.
Can you swim in the Blue Cave?
During the standard tourist visit, swimming in the cave is not permitted.
Visitors remain in the official small boat throughout the tour. The large number of boats entering and exiting through the very narrow opening would make free swimming unsafe, and the Blue Cave is also a protected natural area with a controlled visiting regime.
Therefore, the Blue Cave should not be confused with the Green Cave on Ravnik, where swimming is possible during a typical visit when conditions allow.
If swimming on Biševo is desired, much better options are Porat, Salbunara, or the small beach in Mezuporat.
Can you enter the cave in your own boat?
No, not as part of a normal tourist visit.
Even if you arrive at Biševo in your own sailing boat, speedboat, or small boat, the visit to the cave is organised by an authorised concessionaire.
Your own vessel is left in the Mezuporat area or at a designated mooring, and the tour is conducted in the official small boat.
This is not just a matter of ticket payment. The entrance is very low, the space is limited, and the traffic of boats through it must be controlled.
Attempting to enter the cave independently is not advisable.
How to get to the Blue Cave from Komiža?
If you are already staying on Vis, Komiža is the simplest starting point.
Biševo is about 8.3 kilometres or 4.5 nautical miles from Komiža, making the journey significantly shorter than excursions departing from Split or Hvar.
There are several options:
you can take an organised excursion from Komiža, a taxi boat, or a private trip, and there is also a state ferry line that connects Komiža, Mezuporat, Salbunara, and Porat.
If using the regular line, be sure to check the timetable to allow enough time for the cave and return.
For a guest staying in Komiža, it does not make much sense to take a large all-day tour just to see the Blue Cave. A local trip to Biševo is much shorter and leaves more time for the island itself.
How to get from the town of Vis?
From the town of Vis, there are organised boat trips, but another option is to first get to Komiža, and then continue to Biševo.
Vis and Komiža are about 10 kilometres apart in a straight line and approximately 13 kilometres by road.
A local bus connects the two towns, so it is possible to visit the Blue Cave without a car.
If you have been staying on Vis for several days, going via Komiža offers a much better opportunity to explore Biševo as well as the cave.
And from Split and Hvar?
The Blue Cave is one of the main stops on popular all-day boat trips from Split and Hvar.
Such tours usually connect several locations in the same day – the Blue Cave, Stiniva, Budikovac, the Pakleni Islands, or the town of Hvar, depending on the starting point and organiser.
This is convenient for guests who do not have time to stay overnight on Vis.
However, it is important to have realistic expectations.
A significant portion of the day from Split is spent riding a speedboat across open sea. If the sea is choppy, the journey can be quite uncomfortable, and any potential closure of the Blue Cave can completely alter the tour's plans.
If staying on Vis for several days, a local trip from Komiža is almost always a more relaxed way to visit.
Mezuporat – much more than just a transfer point
Most visitors see Mezuporat only as a place to wait for a boat to the Blue Cave, but this small bay deserves at least a little time.
It is located on the eastern side of Biševo and features a small pebble beach and a dock.
From here, the Geostaza Biševo begins, which connects several important natural and historical sites across the interior of the island.
A Visitor Centre Blue Cave – Biševo has also been established in the Biševo area, featuring multimedia content about geology, marine biology, plants, animals, and the history of the island.
If waiting for your turn for the cave in Mezuporat or if you do not need to return to the boat immediately after the visit, it is worth seeing more than just the waiting area by the sea.
Visitor Centre Blue Cave – Biševo
The Visitor Centre provides context that cannot be gained during the few minutes spent travelling through the cave itself.
Here, one can gain a much better understanding of how Biševo was formed, why the Blue Cave is blue, what organisms live in marine caves, and why this part of the Vis archipelago is so valuable.
The centre is connected to Mezuporat, and transport by electric vehicle is provided for people with reduced mobility between the port and the Centre.
However, entering the Blue Cave itself is still physically demanding as it involves transferring to a small boat and passing through a very low entrance.
Therefore, for those with serious mobility issues, it is advisable to check the possibilities of boarding before arrival.
How long is the wait for the Blue Cave?
This may be the biggest unknown during a summer visit.
The actual ride to the cave and the sightseeing are brief. The wait in Mezuporat can often be much longer.
In July and August, around midday, a large number of organised groups arrive from Komiža, Vis, Hvar, Split, and other places.
When the sea is calm and the cave is open, small boats continuously enter and exit, but capacity is still limited.
For this reason, it is not advisable to organise the next activity to the minute.
If planning a visit during peak season, it is wise to leave enough time for possible waiting.
What to do while waiting?
If arriving via Mezuporat and having more time, waiting does not have to be completely wasted.
You can swim at the small beach in Mezuporat or take a walk into the interior of Biševo.
If the schedule allows for a longer stay, a much better idea is to continue to Porat or Salbunara after visiting the Blue Cave rather than immediately returning to Komiža.
Biševo is too small an island to rush from attraction to attraction – there are practically no tourist cars – but large enough that several hours of walking and swimming reveal a completely different character from what is seen during a quick trip to the cave.
Porat – the best way to continue your day after the cave
On the western side of Biševo lies Porat, a wide sandy bay that is a complete contrast to the dark Blue Cave.
The beach features sand, clear water, and natural shade behind the shore, and there is also a catering offer during the season.
If the boat schedule allows, a very good combination is the Blue Cave in the morning, followed by several hours of swimming in Porat.
This way, Biševo stops being just "the island with one cave" and becomes a true day trip.
Salbunara – the quieter sandy side of Biševo
North of Porat lies Salbunara, also known locally as Sarbunora.
The name is associated with the local term for sand, and the area is known for its old deposits of aeolian sand and rare vegetation.
Salbunara is much quieter than Mezuporat during the peak traffic for the Blue Cave.
If staying on Biševo for the whole day, the combination of the Blue Cave, Porat, and Salbunara provides a much more complete picture of the island.
How did the Blue Cave form?
The Blue Cave is not simply a crack in the rock that accidentally filled with sea water.
Biševo is composed of various layers of limestone, and it is in the area of the cave that the action of tectonic shifts and strong sea waves created the conditions for its development.
After the last Ice Age, the sea level rose, and waves began to act on the rocks of today's coastline. The softer part of the rock at the site of the current underwater entrance eroded more quickly than the surrounding limestone.
The sea continues this process even today.
For this reason, the Blue Cave has been protected as a geomorphological natural monument since 1951, and it is also one of the key sites of the UNESCO Global Geopark of the Vis Archipelago.
The Blue Cave is also a living marine ecosystem
Although most visitors only see blue water during their few minutes in the cave, the rocks are not empty.
A scientific study conducted in 2019 recorded as many as 119 species of marine organisms in the Blue Cave, five of which are strictly protected by law.
The organisms that live here are adapted to the conditions of semi-darkness and specific light changes.
This is one of the reasons why visits to the cave are strictly controlled.
The Blue Cave is not just a photogenic tourist attraction but a protected natural habitat.
Eugen von Ransonnet and the year 1884
It is often written that the Austrian baron Eugen von Ransonnet "discovered" the Blue Cave in 1884.
This is an oversimplification.
The local inhabitants and fishermen of Biševo were already familiar with the cave. Ransonnet introduced it to the wider European public, described and painted its interior, and published a story about the cave in the Vienna press.
In August 1884, his article about the "blue grotto of the island of Busi", the then Italian name for Biševo, was published in the Vienna newspaper Neue Freie Presse.
His descriptions sparked great interest.
Ransonnet even compared the beauty of the Biševo cave to the famous Grotta Azzurra on Capri.
The current entrance for boats has not always been like this
Initially, entry to the Blue Cave was possible only through the underwater opening.
After Ransonnet described the cave, the opening on the sea side was widened so that a small boat could pass through.
The current low entrance, about 1.5 metres high, thus allows for tourist visits without diving.
Despite this, the entrance remains so low that its accessibility completely changes with the height of the waves.
This combination of a very small passage and the large blue chamber behind it makes the first entry particularly impressive.
How big is the Blue Cave?
The Blue Cave is approximately 24 metres long, about 10 to 12 metres wide, and the height of the main chamber reaches approximately 15 metres.
This means it is not a massive cave like large terrestrial speleological systems.
However, the experience of the space is greater than the numbers suggest.
The reason is the contrast between the small entrance and the high interior chamber, with light that does not come classically from above but seems to emanate from the sea itself.
Blue Cave or Green Cave – which is better?
These are two completely different attractions, and it makes little sense to choose between them as if they offer the same experience.
The Blue Cave on Biševo is smaller, accessed by an official small boat, the visit is brief, and the main reason for coming is the incredible blue-silver light.
The Green Cave on Ravnik is much more open. Light enters through an opening in the ceiling, and when the visiting regime and sea conditions allow, swimming is possible there.
If staying on Vis for several days, it is worth visiting both precisely because they are so different.
Is the Blue Cave suitable for small children?
Children can visit the cave, but parents should consider a few things.
Getting there involves a boat ride over the sea, transferring to a smaller boat, and a low entrance to the cave. For calm seas, this is not a problem for most children, but for a child who struggles with boat rides, the experience may be more challenging.
One should also consider the potential waiting time in Mezuporat during the peak season.
On the other hand, the actual tour is very short, and the blue interior often becomes the most interesting part of the entire excursion for children.
What to bring?
Not much equipment is needed for the Blue Cave itself.
The most important items are sun protection, water, and footwear that allows for safe entry and exit from the boat.
If the excursion continues to Porat or another beach on Biševo, it is worth bringing a towel and swimwear.
For the speedboat ride from further locations, a light jacket or long-sleeved shirt can be useful as it may be cooler on the sea than on the shore, even in the middle of summer.
Those sensitive to seasickness should consider that the route to Biševo is exposed to open sea.
When are there the least people?
The largest crowds occur during July and August, especially during the best daily lighting period for the cave.
June and September offer a much better ratio of pleasant weather, warm sea, and fewer visitors.
If visiting during peak season, arriving earlier can reduce waiting time, but the blue effect may be somewhat weaker then.
There is no perfect solution: the best light attracts the most people.
Is the Blue Cave worth it despite the crowds and short visit?
This is a valid question.
The experience in the cave is brief, there may be waiting during peak season, and there is an entrance fee. Someone expecting an hour of exploring the underground may be disappointed.
However, the Blue Cave is not interesting because of its duration.
Moments after passing through the low dark entrance, the sea beneath the boat becomes almost electric blue, the rocks are illuminated from below, and paddles and parts of the boat beneath the surface appear as if made of silver.
This play of natural light is not easily seen elsewhere.
The biggest mistake is to come to Biševo solely for a few minutes in the cave and leave immediately.
If the Blue Cave is combined with Mezuporat, Porat, Salbunara, a walk along part of the Geostaza, or the Visitor Centre, the entire excursion makes much more sense.
The Blue Cave is a reason to come, but Biševo is a reason to stay
Most people first come to Biševo solely for the Blue Cave.
This is understandable. The cave is one of the most recognisable natural phenomena in Croatia and a site whose photographs have represented Vis and central Dalmatia for decades.
However, after disembarking from the small boat, it is worth not heading straight back to Komiža.
Biševo has sandy Porat and Salbunara, Medvidina Cave, the church of St. Silvester, old paths, vineyards, Stražbenica, and nearly twenty kilometres of Geostaza.
The Blue Cave may last only a few minutes. Biševo can easily fill an entire day.
This is the best way to visit: see the cave in good light, and then explore the island where it was formed.
Location: Balun Bay, eastern coast of Biševo
Distance from Komiža: 4.5 NM / about 8.3 km
Length of the cave: about 24 m
Width: about 10–12 m
Height: up to approximately 15 m
Entrance for tourist boats: about 1.5 m high and 2.4 m wide
Best time for the blue effect: approximately 10 am–2 pm, depending on the season and weather
Mode of visit: exclusively organised small boat by an authorised concessionaire
Starting point for the tour: Mezuporat Bay on Biševo
Duration of the tour from Mezuporat: approximately 20 minutes
Swimming during the standard tour: no
Dependence on weather: very high; waves can prevent entry even on sunny days
Protection: geomorphological natural monument since 1951
UNESCO: key site of the UNESCO Global Geopark of the Vis Archipelago
EN name: Blue Cave
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