Fershampenuaz (Russian: Фершампенуаз, from French: Fère-Champenoise) is a rural locality (a selo) and the administrative center of Nagaybaksky District of Chelyabinsk Oblast, Russia, located on the left bank of the Gumbeyka River (a tributary of the Ufa). Population: 4,368 (2010 Census); 4,435 (2002 Census); 4,349 (1989 Census). Postal code: 457650.