Stara Planina Mountain is the largest mountain in eastern Serbia and a massif which forms a natural border with Bulgaria. Vast areas of green, fresh air and a number of warm springs of mineral water are the features of Stara planina (Old mountain ie. the Balkan mountains), a mountain range stretching across two countries. Stara Planina spends almost five months a year under snow cover. The natural features of Stara Planina are also ideal for hiking, hang gliding and paragliding, fishing and picking medicinal and aromatic plants and mushrooms. Midzor is the topmost point. Babin Zub is one of the highest peaks on Stara Planina, standing 1780 m above sea-level.