Dive Dugi Otok diving base is located in Zaglav, Dugi otok (Long island).
Dugi otok is the largest island in the North Dalmatian archipelago, one of the largest in the Adriatic. It is 124 km long and between 52 km and 4 km wide. Among a series of lime-stone mountain ridges, with Vela Straža being the highest (338 m), spread fertile Karst fields. The south-west coast of the island is steep, with beautiful cliffs, and the rest of the island coast gently descends towards the sea, with numerous smaller and larger bays, among them Solišćica, Sakarun, Pantera and Telašćica with sandy beaches.
The cultivable part of Dugi Otok is covered with olive trees, vineyards and vegetable gardens, and on the rest of the island there are woods and macchia groves.