The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Osogovska Planina

(Osogov Mountains), mountains in Bulgaria and Yugoslavia between the Struma and Vardar rivers. Composed mainly of crystalline rocks, they are 70 km long and reach a maximum elevation of 2,252 m (Rujen Peak). The relief is worn down, and the slopes are covered with pine and beech forests; meadows are found on the summits.

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