San Marino is a small country in Southern Europe. Located on the northeastern side of the Apennine Mountains, San Marino covers a land area of just over 61 km2 (24 sq mi), and has a population of 33,562. San Marino is an enclave surrounded by Italy in Southern Europe, on the border between the regions of Emilia Romagna and Marche and about 10 km (6.21 mi) from the Adriatic coast at Rimini. Its hilly topography, with no flat ground, is part of the Apennine mountain range. The highest point in the country, the summit of Monte Titano, is 749 m (2,457 feet) above sea level; the lowest, the Ausa River (ending in the Marecchia), is 55 m.