What are the prominent physical features in Bulgaria?

- Balkan Mountains (Stara Planina)

- Rila Mountains (Rila)

- Pirin Mountains (Pirin)

- Rhodope Mountains (Rodopi)

Valleys

- Danubian Plain (Dunavska ravnina)

- Thracian Plain (Trakiyska ravnina)

Rivers

- Danube (Dunav)

- Iskar (Iskar)

- Maritsa (Maritsa)

Lakes

- Lake Srebarna (Srebarna)

- Lake Beloslav (Beloslav)

- Lake Burgas (Burgas)

Coasts

- Black Sea Coast

- Aegean Sea Coast