The Yenisei ("Енисе́й") is a river in Siberia. It belongs to the greatest river system that flows into the Arctic Ocean. The Yenisei is the fifth-longest river in the world. It is a little shorter than the Mississippi River, but with 1.5 times the flow. It comes from Mongolia and follows a northern course to the Kara Sea. The river drains a large part of central Siberia. The longest stream following the Yenisei-Angara-Selenga-Ider is about 5539 km long. Its watershed, which includes the world's largest (by volume) lake, Lake Baikal, holds more water than any other river system.