The Western sector of the Black Sea consists of the eastern coastline of the Mizia Plain, the Balkan Range and the transition zone of mountains and valleys. It is 200 km long and 90-180 km wide. The Western sector is divided into three parts - Northern, Central and Southern.

The Northern part of the sea shore reaches 1-2 m to the north and 290 m to the south. The seashore is lowest at Cape Shabla with vast beaches and beautiful lakes. The highest part is the Frangensko Lake at an altitude of 290 m where is the biggest landslide along the Bulgarian Black Sea coastline.

The Central part occupies the seashore of the Balkan Range among the valleys of the Kamchiya and Aheloy Rivers. The shores are steep with landslides at some areas, jutting out capes and vast beaches at the mouths of the rivers. The most famous and biggest beach is at the Sunny Beach resort.

The Southern part consists of low shores deeply lined by peninsulas and rocky capes. Small lagoons separate the river mouths from the sea. There are some large lakes in the region: the Pomoriysko, Atanasovsko and Mandrensko Lakes. The abrasion has formed picturesque corridors - fiords and small caves in the volcanic rocks. There are also some small islands - Saint Pavel, Saint Iliya and Saint Anastasiya.