Ostrovica Fortress is a ruined medieval fortification on a solid rock jutting from the top of the hill above the village of Ostrovica in Zadar County, Croatia. It is located between the two historical and geographical regions, Bukovica and Ravni Kotari. It was once an important stronghold, known as the "Key to the City of Zadar", as it was a key defense of the city. It was destroyed during the Ottoman–Venetian Wars in the second half of the 17th century, leaving only a few remains.

Bribir is a village in Šibenik-Knin County, near the town of Skradin, in southern Croatia. In its location in the Roman period was town Varvaria, while during the medieval times it was an important and rich settlement with a stronghold and Franciscan monastery, a capital city of power of the Šubić family.