Sušac (dry island) is a small rocky island in the Adriatic Sea with an area of 4.03 km2, and 16.4 km[1] of coastline southwest of Korčula and Lastovo, on the halfway to the island of Vis, in Croatia.
The coast consists of slopes and cliffs over 100 meters tall, but the opposite side features a natural harbour. A 19th-century lighthouse is built on top of the island.
The island is also known for its little lake, which is connected to the sea through a siphon 15 meters deep.

http://en.wikipedia.org/wiki/Su%C5%A1ac