Osogovo

Osogovo (Bulgarian and Macedonian Cyrillic: Осогово) or Osogovska Planina (Осоговска планина or Осоговска Планина) is a mountain between southwestern Bulgaria (Kyustendil Province) and northeastern Republic of Macedonia. It is about 110 km long and 50 km wide, the highest peak being Ruen (Руен) at 2251 m. Osogovo is the northernmost and highest part of the Osogovo-Belasica group and is situated between the Kyustendil and Kamenitsa Valleys, Dobro pole and the Bregalnica and Kriva Reka river valleys. The west slopes are steep and the southeast ones are slant, the mountain being rich in polymetal ores.

Deciduous and coniferous forests dominate. The area is inhabited by the rare Alpine Newt. The nature and climate conditions allow for all-year tourism. Important towns at the foot of Osogovo are Kyustendil to the northeast in Bulgaria and Kočani and Kriva Palanka to the west and southwest in the Republic of Macedonia.