The Russian Plain (Russian Русская равнина, Russkaya Ravnina), also called East European Plain (Russian Восточно-Европейская равнина, Vostochno-yevropeyskaya Ravnina), is a plain and series of broad river basins in eastern Europe (including western Russia ). It extends over nearly 4,000,000 square km and averages about 170 m in height. The plain is subdivided into a number of distinct regions, including the Valday Hills ; the Central Russian Uplands ; the Volga Uplands ; and the Dnieper River, Black Sea, and Caspian Sea lowlands.