Sestrunj (Italian: Sestrugno) is an island in Croatian part of Adriatic Sea. It is situated in Zadar archipelago, between Ugljan, Rivanj and Dugi Otok. Its area is 15.1 square kilometres (5.8 square miles), and it has population of 48 (as of 2011). The only settlement is also called Sestrunj and is located in the island's interior. The island is partially covered with maquis shrubland and low forests. Reminds of Illyrian fort are situated at island.