The Ili River flows into the southeastern edge of Lake Balkhash, where it forms a large delta of about . The delta is situated between the Saryesik-Atyrau Desert and the Taukum Desert. An area of 9,766 km2 (3,771 sq mi) within the delta has been designated as a Ramsar Site. This site has 427 species of plants and 345 species of animals, including important populations of rare species (Dalmatian pelican, goitered gazelle, marbled polecat, white-headed duck, red-breasted goose, ship sturgeon, and others). The delta has also become popular amongst anglers for its wels catfish, which can grow up to over . The Ili river ranks third in Kazakhstan after the Irtysh river and the Ural river in terms of water content.