Original: Rising in Mongolia, it follows a northerly course to the Yenisei Gulf in the Kara Sea, draining a large part of central Siberia, the longest stream following the Yenisei-Angara-Selenga-Ider.
Simplified: The river drains a large part of central Siberia, the longest stream following the Yenisei-Angara-Selenga-Ider is about 5539 km long.