Oka

Navigable river in the western Russian Federation, a major tributary of the Volga; length 1,500 km/932 mi. The Oka rises in the central Russian upland near Orel and flows northeast to join the Volga at Nizhniy-Novgorod. The main ports on its course are Kaluga, Ryazan, Dzerzhinsk, and Nizhniy-Novgorod.

Oka

Resort in southern Québec, Canada, on the Lac des Deux-Montagnes, at the mouth of the Ottawa River, 13 km/8 mi west of Montréal Island; population (1991) 1,700. The Native Canadian Kanesatake Mohawk reserve adjoins Oka to the west, and a provincial park lies to the east. In 1990 expansion onto Kanesatake land caused an armed confrontation and brought international attention to the cause of Québec's Native Canadian peoples.

Oka was the site of a Sulpician mission, established in 1717 for several Native Canadian groups. The large Trappist Abbey of Notre-Dame-du-Lac was founded in the 1880s.