Ryazan (Russian: Рязань; IPA: [rʲɪˈzanʲ]) is a city and the administrative center of Ryazan Oblast, Russia, located on the Oka River 196 kilometers (122 mi) southeast of Moscow. Population: 524,927 (2010 Census); 521,560 (2002 Census); 514,638 (1989 Census).