Island Biševo is known mostly for a Blue cave (Modra spilja). Is accessible through rock gate, but only when the sea is quite. The cave is long 31m and is board 17m, sea is deep 18m.
The light infiltrate into the cave through rock’s hall under the water and the break of rays makes great color from silver-blue-grey to green-blue.
Intensity of the light radiation is comparing with the Blue cave at Capri. The best time for visit is between 10 and 12 hours a.m.