Hammar, Lake

Arabic  Hawr Al-hammar,   large swampy lake in southeastern Iraq, south of the junction of the Tigris and Euphrates rivers. Fed by distributaries of the Euphrates, the lake (70 miles [110 km] long; 750 square miles [1,950 square km] in area) drains via a short channel into the Shatt al-Arab near Basra. It was once only a reed-filled marshland but was later utilized as a natural irrigation reservoir for the fertile soils