Bulgaria is a small country situated in Southeastern Europe, in the east of the Balkans. Its territory covers an area of , while its land borders with its five neighbouring countries have a total length of , and its coastline has a length of . Bulgaria's geographic coordinates are 43° N 25° E. The most notable topographical features of the country are the Danubian Plain, the Balkan Mountains, the Thracian Plain, and the Rila-Rhodope massif. The southern edge of the Danubian Plain slopes upward into the foothills of the Balkans, while the Danube defines the border with Romania. The Thracian Plain is roughly triangular, beginning southeast of Sofia and broadening as it reaches the Black Sea coast.