Biševo Island – Blue Cave, Sandy Beaches and the Hidden Part of the Vis Archipelago

Biševo is a small offshore island located southwest of Vis, opposite Komiža, best known for the famous Blue Cave. However, to reduce Biševo to just a few minutes spent in the cave would mean missing out on much of what makes this island special. Beyond its most well-known attraction lie sandy coves, old paths between small island settlements, vineyards, the Church of St. Sylvester, an unusual geological history, and life on an island that today has a permanent population of only around twenty residents.

Biševo covers an area of 5.91 km², measuring approximately four kilometres in length and up to two kilometres in width. The highest point is Stražbenica, at 239 metres above sea level. The island is small enough that distances on the map appear short, but the terrain, inclines, and summer heat mean that ample time should be allocated for walking tours.

Biševo is part of the UNESCO Global Geopark Vis Archipelago, along with Vis and the surrounding offshore islands and islets such as Sveca, Brusnik, Jabuka, and Palagruža. The island clearly demonstrates how the sea, limestone, tectonic processes, and wind have shaped the current landscape, caves, and unusual sandy areas over a long period.

Blue Cave – The Most Famous Attraction of Biševo

The majority of visitors to Biševo come for the Blue Cave, located in Balun Cove on the eastern side of the island, approximately 4.5 nautical miles or 8.3 kilometres from Komiža. The cave is about 24 metres long and 10 to 12 metres wide, and its renowned blue-silver hue is created when sunlight penetrates through an underwater opening, reflecting off the bright bottom into the cave.

Entry is possible via small boats through a very low natural opening, approximately 1.5 metres high and 2.4 metres wide. Consequently, access to the cave also depends on sea conditions – when the waves are too high, safe entry is not possible. The Blue Cave has been protected as a geomorphological natural monument since 1951. Organised visits commence from the nearby Mezuporat Cove.

The cave was introduced to the wider European public in 1884 by Austrian painter and explorer Eugen von Ransonnet, after which Biševo became known far beyond Vis and Dalmatia. Today, the Blue Cave is one of the most visited natural attractions in this part of the Adriatic.

If one wishes to see only the Blue Cave, an organised trip from Komiža is sufficient. However, to truly experience real Biševo, it is worthwhile to stay on the island after visiting the cave and venture beyond Mezuporat.

Mezuporat – The Gateway to Biševo and Starting Point for the Blue Cave

Mezuporat is a small cove on the eastern side of the island and the main point where many visitors to the Blue Cave arrive. Here, transfers to small boats that enter the cave take place, and the cove is also connected to the rest of the island. The Komiža Tourist Board lists Mezuporat as one of the main locations on Biševo.

In the sea in front of Mezuporat, an ecological mooring system is employed to reduce anchoring on seagrass meadows. This serves as a good reminder that Biševo, despite the large number of daily visitors to the Blue Cave, remains a sensitive island area where tourism must adapt to nature, not the other way around.

Nearby is the Visitor Centre Blue Cave – Biševo, dedicated to the natural, geological, and cultural heritage of the island. The centre provides a much broader picture of Biševo than what is gained during a brief visit to the cave.

Porat – The Most Famous Sandy Beach on Biševo

On the western side of the island lies Porat, a deeply recessed and well-protected cove featuring one of the most beautiful sandy beaches in the Vis and Biševo area. Unlike most beaches on Vis, which are dominated by pebbles and rocks, Porat boasts a sandy shore and shallow, clear waters. The Komiža Tourist Board also officially lists it as Biševo's sandy beach.

Porat is therefore a good choice for longer swimming sessions after visiting the Blue Cave. The cove is surrounded by slopes and greenery, offering a completely different atmosphere compared to the busy Mezuporat during peak summer crowds.

Porat can be reached by boat, but also via land through the island's interior. This combination of visiting the Blue Cave, walking across Biševo, and ending the day at Porat provides a much more complete experience of the island than a typical quick excursion.

Salbunara – Sand, Peace, and the Unique Nature of Biševo

Not far from Porat is Salbunara, another of Biševo's most beautiful areas. The very name is associated with sand, which is one of the island's greatest features.

The sand on Biševo is not only interesting to bathers. Geological studies indicate that it was brought by strong winds during the ice ages when sea levels were significantly lower than today. These deposits have left fertile soil and sandy coves that distinguish Biševo from most neighbouring Adriatic islands.

The Salbunara area is particularly valuable due to its vegetation. Sea lilies grow in the sand, and rare and endangered plant species have been recorded, including a plant that occurs naturally only on Biševo. For this reason, plants and flowers in sandy areas should not be picked.

For swimming and a quieter stay, Salbunara is one of the parts of the island worth including if staying on Biševo for more than a few hours.

Medvidina Cave – A Protected Cave of the Mediterranean Monk Seal

On the southern coast of Biševo, in Trešjavac Cove, lies Medvidina Cave. It is approximately 160 metres long and is considered the longest semi-submerged sea cave in the Adriatic. It is named after the Mediterranean monk seal, which the locals referred to as "sea man", and which once used the cave as a shelter and a place to raise young.

Medvidina Cave has been protected as a geomorphological natural monument since 1967. Entry is not permitted today: due to the protection of this sensitive habitat and the risk of landslides, strict restrictions have been implemented, so this location should be viewed as a protected natural area rather than another tourist cave like the Blue Cave.

Poje, St. Sylvester, and the Interior of Biševo

Those venturing inland from the coast will quickly see a very different Biševo. The houses are not clustered into a large settlement but are scattered across smaller locations and around old agricultural areas.

In Poje, there was an island school built by the residents in 1937. The school operated until 1961, when it closed due to a declining number of children. Today, the story of the school is one of the best indicators of how life on Biševo has changed over the 20th century. Before the Second World War, several hundred people lived on the island, while today the permanent population is only around twenty.

Even further back in history is the Church of St. Sylvester. The Benedictine community on Biševo was established as early as 1050, when a priest named Ivan from Split built a church on the island and handed it over to the Benedictines from the Tremiti Islands. The Biševo Abbey later had estates on Vis and Hvar and was an important part of the history of this offshore area for centuries.

The current appearance of the church is the result of later renovations; the Komiža Tourist Board dates the present structure to the 16th century, and mass is held there on the feast of St. Sylvester.

Geostaza Biševo – The Best Way to Explore the Island on Foot

If staying on Biševo long enough, one of the best ways to get to know the island is through the Geostaza Biševo. This trail connects not only geological points of interest but also the stories of the people, vineyards, the old school, the church, caves, sandy deposits, and plants that have developed in this isolated space.

Walking on Biševo best illustrates how different the island is from the image a traveller receives when arriving by speedboat, entering the Blue Cave, and immediately returning to Vis. The interior lacks the hustle and bustle of urban life and typical tourist infrastructure. Among the houses, dry stone walls, low vegetation, and former vineyards, the character of a small offshore island is still palpable.

In summer, it is essential to carry enough water, sun protection, and good footwear. Biševo does not have its own public water supply system, and drinking water for the residents is still brought to the island, making it all the more important to set off on a day trip with your own water supply.

How to Get to Biševo

The main starting point for Biševo is Komiža on the island of Vis. During the tourist season, numerous organised excursions and private boats depart from Komiža to the Blue Cave and other coves of Biševo.

Biševo is also connected to Komiža by the regular state boat line 612 Komiža – Biševo – Komiža. This is a passenger boat service, not a ferry for transporting cars. The timetable changes between the season and the rest of the year, so it should be checked on the official websites of the City of Komiža or the Coastal Line Shipping Agency before travelling.

For a day trip, the simplest option is an organised excursion from Komiža. If you wish to walk around the island, visit Porat or Salbunara, and see more than just the Blue Cave, the regular boat line or pre-arranged transport offers much greater freedom.

Biševo does not have a ferry connection for cars. There are local roads and vehicles belonging to residents on the island, but for visitors, Biševo is primarily an island to be explored on foot and by boat.

When is the Best Time to Visit Biševo?

Summer is the easiest time to visit due to the highest number of boat excursions, warm sea, and swimming at Porat and Salbunara. At the same time, it is when the Blue Cave sees the most visitors.

If the aim is to experience the quieter side of the island, June and September are interesting months, when the days are still long enough for walking and swimming, and the pressure from day-trippers is usually less than at the peak of the season.

When taking a boat trip, one should always consider sea conditions. Biševo is an offshore island, and wind and waves can affect the regular service, tourist excursions, and the ability to enter the Blue Cave. Therefore, it is advisable to check the weather forecast and current sailing information shortly before departure.

Biševo is More Than Just a Trip to the Blue Cave

The Blue Cave is the reason Biševo is known worldwide, but the best experience of the island begins only when one stays a little longer after visiting the cave.

Swimming at the sandy beach in Porat, the tranquillity of Salbunara, a walk towards Poje and St. Sylvester, and views of the dry stone walls and abandoned agricultural areas reveal another side of the island – one that is not seen during a quick speedboat trip.

Biševo is a small island, but within just a few square kilometres, it combines two protected marine caves, sandy beaches that are rare in this part of Dalmatia, nearly a thousand years of documented history, and a very small number of people who still maintain life on the island. For this reason, it is worth spending more time there than just a visit to the Blue Cave.