Yasnogorsk (Russian: Ясного́рск) is a town and the administrative center of Yasnogorsky District of Tula Oblast, Russia, located on the Vashana River (Oka's tributary), 35 kilometers (22 mi) north of Tula. Population: 16,795 (2010 Census); 18,588 (2002 Census); 21,292 (1989 Census).