Prežba is a small uninhabited island in the Croatian part of the Adriatic Sea, located northwest of the island of Lastovo in southern Dalmatia. It is connected to Lastovo by a bridge at the village of Pasadur on Lastovo. Prežba's area is 2.81 km², but its coastline is 14.23 km long, due to the large number of coves on the island. Its highest peak is 136 m above sea level and there is a lighthouse on the south side of the island, across the bay from Ubli. The island was used by the Yugoslav People's Army as a military base containing a tunnel and tunnel for ships.