 The basin above the lake is known as the Upper Litani Basin (ULB), and that below the lake is called Litani's lower reaches.The Qaraoun reservoir or lake created by El Wauroun Dam on the Litani River has a water spread area of .It is the largest artificial lake in Lebanon, located in the southern part of the fertile Beqaa Valley, with a total capacity of about and effective storage (live storage) of .