Belogorye Nature Reserve (Russian: Белогорье заповедник) (also Belogor'e) is a Russian 'zapovednik' (strict nature reserve), one of the last intact riverine old-growth oak forests (some oaks being over 300 years old), which was once representative of the East European forest-steppe. The reserve is one of the oldest and smallest nature reserves in Russia, first formed in 1924 but reorganized several times since. It is on the southwestern slope of the Central Hills on the western edge of Russia. The reserve is situated in the Belgorodsky District of Belgorod Oblast. The reserve was created in 1935, and covers an area of 2,131 ha (8.23 sq mi).