To the east of the bay of Baška, there are two deeply indented coves, Vela Luka and Mala Luka. These inlets of sea into the land isolated the small peninsula Sokol on the northern and southern side.
Topographically, the entire area is enclosed from the land side, west and south-west, with large rocky mountainous massifs from 250 to more than 350 meters high, so it can be accessed only from the east, sea side. According to the architectural remains, the area was inhabited in the late Antiquity, and the settlement was conditioned by two factors – firstly, by well protected sea coves, Vela Luka and Mala Luka, and by the agricultural fields stretching in the lowland area of Bosar.
The castrum Korintija emerged on the peninsula Sokol, rising up to 129 meters. The castrum is dated into the time of late Antiquity as one of a series of structures of early Byzantine military architecture, emerged along the east Adriatic coast during the spread of castrization. This and similar castrums served as watchtowers and military bases, while their function resulted from the wish to make the waterways safe, but also to serve as refuge for the nearby villages. Within the fortress walls, on the north-east slightly elevated plateau, there are still the remains of the church dating from the 6th century.