This is largest river system flowing to the Arctic Ocean. It has a length of 3,445 miles. It is the most famous of three great Siberian rivers that flow into the Arctic Ocean. Rising in Mongolia, the river follows a northerly course to the Yenisei Gulf in Kara Sea, draining a huge part of the central Siberia, the longest stream following the Yenisei-Angara-Selenga-Ider River system.