The PS1 Bosporus Site encompasses the shelf and slope between Demirköy and Kandra districts, along a coastline shared by İstanbul, Kırklareli, and Kocaeli provinces, with a combined population of approximately 20 million. Spanning an area of about 12,500 km², the region is notable for the Mediterranean bottom water inflow from the İstanbul Strait, which supplies oxygen to the Black Sea's anoxic layer.

The area's mesoscale hydrographical features, bounded by the Rim Current to the north and the coastline to the south, create a retention zone crucial for small pelagic fish migrating between nursery and overwintering grounds. Unlike most of the southern Black Sea, characterized by a narrow continental shelf, this region has a shelf extending up to 50 km offshore, providing vital habitat for demersal fish species.

In PS1, fisheries and maritime transport have long been dominant sectors, while tourism and offshore energy (wind and wave) hold significant growth potential.