The mountains of Lebanon are drained by seasonal torrents and rivers foremost of which is the  long Leontes that rises in the Beqaa Valley to the west of Baalbek and empties into the Mediterranean Sea north of Tyre. Lebanon has 16 rivers all of which are non navigable; 13 rivers originate from Mount Lebanon and run through the steep gorges and into the Mediterranean Sea, the other three arise in the Beqaa Valley.