Unified Deep Water System of European Russia

The Unified Deep Water System of European Russia (Russian: Единая глубоководная система Европейской части Российской Федерации, romanized: Yedinaya glubokovodnaya sistema Yevropeyskoy chasti Rossiyskoy Federatsii) or UDWS (Russian: ЕГС) is a system of inland waterways in Russia linking the White Sea, the Baltic Sea, the Volga River, Moscow, the Caspian Sea and—via the Sea of Azov—the Black Sea. In 2010, UDWS carried 70 million tons of cargo and 12 million passengers, making up two-thirds of overall inland waterway traffic volume in Russia.

Source: Wikipedia — Unified Deep Water System of European Russia (CC BY-SA 4.0)