The PS2 Western Shelf lies within the Bulgarian Exclusive Economic Zone (EEZ), spanning the shelf area up to the 200-meter isobath and covering 12,619 km². It stretches from the RO-BG border in the north to the BG-TR border in the south. The coastline is 432.35 km long, representing 11% of the total Black Sea shoreline, with 362.62 km consisting of natural landforms and 69.89 km classified as technogenous.

The northern coastline (Cape Sivriburun to Cape Emine) is predominantly straight, lacking major bays. Varna Bay, the largest along this section, measures 7 km in length, with a maximum depth of 19 m, and connects to the freshwater Varna Lake. The city of Varna, Bulgaria's second-largest economic hub and its biggest seaside resort, is located here. The Kamchia River, the largest flowing into the sea, contributes 82% of the total river outflow. Its catchment area (5,358 km²) covers 40% of Bulgaria's Black Sea drainage basin, delivering approximately half of the national freshwater discharge.

The southern coastline (Cape Emine to the TR border) features soft and medium malleable silts with shells on the seabed, transitioning to terrigenous sediments in the southernmost sections. Burgas Bay, the largest bay along the Black Sea coast, spans 33 km in width and 25 km in length, with a maximum depth of 37 m. The northern part of Burgas Bay has medium sensitivity to coastal erosion, while the southern part has low sensitivity. Seven small rivers flow directly into the southern region, contributing a combined outflow of 14.39 m³/s, with the Veleka River accounting for 61% and the Ropotamo River 9%.