The Five Rivers of Lebennin are the following:
- The river Erui,
- The river Sirith, which met the river Anduin at Pelargir,
- The river Celos, which started in the White Mountains and became a tributary of the river Sirith,
- The river Serni, which began in the plains of Lebennin and emptied into the Bay of Belfalas west of the Ethir Anduin and southwest of the city of Linhir, and
- The river Gilrain, which started as two unnamed tributaries in the White Mountains, and flowed south meeting the Serni at Linhir.