Bay Telašćica at which the whole nature park is named, is in the southeastern part of the island. The supply is drawn approximately 8 km to its south, the widest part of the broad is about 1.6 km. That part of the bay, which is facing south is open to the neighboring archipelago. Bay is highly indented, and contains 25 bays, capes and 5 islets.

Thanks to its position is protected from winds from the south shore and the open sea. Because of these features Telašćica is one of the largest and best-protected natural harbor on the east coast. Most part of the bay was covered with seagrass communities, habitats exceptionally rich fauna and significant for the propagation of many species of fish.