Kazbek, Mount (kŏzbĕkˈ, Rus. kəzbyĕkˈ) [key], peak, 16,541 ft (5,042 m) high, N Georgia, in the Greater Caucasus. An extinct volcano, it rises above the Daryal gorge and the Georgian Military Road. Its glaciers give rise to the Terek River. Mt. Kazbek was first scaled in 1868. An alternate spelling is Kasbek.