The Blue Cave is situated on Bisevo island (5.8 sq. kilometres) about five kilometres south west from Vis island. The central part is a fertile field while the rest of the island is covered with marquis or rocks. On the north of the island there is a dense pine forest. The settlements on the island are: Potok, Polje, Nevaja, Mezuporat and Salbunara. There are a few caves on the island, of which Modra Spilja (the Croatian name) is the most famous. Around noon, when the sea is calm, the rays of the sun that penetrate through the underwater opening to the Cave reflect from the white sandy floor and colour the cave in blue and objects in the water in silver. The cave has been accessible since 1884, and approach is possible only by boat. The coastal sea belt is a rich fishing area.
Minimum of 8 people is required for this tour.