Ust-Kamchatsk (Russian: Усть-Камча́тск) is a rural locality (a settlement) and the administrative center of Ust-Kamchatsky District of Kamchatka Krai, Russia, located on the eastern shore of the Kamchatka Peninsula at the mouth of the Kamchatka River some 50 kilometers (31 mi) away from the Klyuchevskaya Sopka volcano and 522 kilometers (324 mi) from Petropavlovsk-Kamchatsky. Population: 4,352 (2010 Census); 5,231 (2002 Census); 13,611 (1989 Census).