The Ока River is a significant waterway in Russia, flowing for about 1,500 kilometers. It is a tributary of the Volga River and primarily runs through the Oka-Don Plain. The river is known for its picturesque landscapes and is an important resource for local communities. The Ока River passes through several regions, including Moscow Oblast and Nizhny Novgorod Oblast. It supports various ecosystems and is home to diverse wildlife. The river also plays a crucial role in transportation and irrigation, contributing to the economy of the surrounding areas.