DUGI OTOK (Long Island), an island in the Zadar group of islands of the northern Dalmatian archipelago. It stretches in the direction north-west - south-east, with the island of Molat in the north and the island of Kornat in the south. Karst fields, such as Velo Jezero, Arnjevo, Stivanje, Sridnje, etc., stretch between the ranges of limestone crests, with the highest peak Vela Straza (338 m).

There are also many caves (Strasna Pec, Kozja Pec, Veli Badanj, Crvene Rupe and Pecina - in English: Oven of Horrors, Goat's Oven, Great Vat, Red Holes and Cave). Water sources or streams do not exist on the island. The southern part of the island is rocky ground, while the middle and western parts are covered with underbrush, with patches of woods.

The western coast of the island is steep and high, with a number of islets along it. Other coasts are lower, with a number of coves and sand shores such as Soliscica, Pantera and Telascica. Economy is based on farming, viticulture, olive growing, livestock breeding and fishing. The largest place is Sali, other places being Zaglav, Zman, Brbinj, Bozava, Luka, Veli Rat, Soline, Dragove and Savar.

Dugi Otok was mentioned by Constantine Porphyrogenitus in the mid-10th century under the name Pizuh (preserved in the name of the locality Cuh near the Telascica Bay). In the 10th-11th century the island was mentioned in the sources as Insula Tilagus (the name was preserved in the name of the Telascica Bay).

The name Veli Otok (Big Island) was first mentioned in a Glagolitic source from 1460. More prominent peaks of the island comprise the remains of Illyrian fortified settlements and stone grave-mounds. A large Roman mansion (villa rustica) stood once on the isthmus of Mala Proversa. The mansion was partly investigated and conserved. Early Croatian remains include small churches, small houses built in dry construction technique and graves.