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 . The power generation is a primary benefit, which meets about 7%–10% of the power requirements in Lebanon. However, the stored waters also provide irrigation benefits with flows of , as 110 million cubic metres is used in South Lebanon and 30 million cubic metres in Beqaa, while is used for domestic water supply in the Southern Lebanon. Controlled reservoir operation also provides flood-control benefits and prevention of water logging in an area of about .