Country/territory: Bulgaria
Central coordinates (latitude / longitude): 42°06'28"N (42.1078°) / 023°31'18"E (23.5217°)
Area (reported): 143,733 hectares / 1,437.33 km² / 355,172 acres / 554.96 square miles
Area (GIS-derived): 143,829 hectares / 1,438.29 km² / 355,409 acres / 555.33 square miles
Altitude: 683–2899 m (2,240–9,509 ft)