The Ebrié Lagoon is one of three long, narrow lagoons that line the shores of the West African state of Ivory Coast. With a length of 62 miles (120 km) and an average width of 2 miles (4 km), it is the largest lagoon in West Africa. Its average depth is 16 ft (5 m). At its eastern end, it connects to the Atlantic via a narrow artificial channel, the Vridi Canal, opened in 1951. Abidjan, the largest city in Ivory Coast, stands on several converging peninsulas and islands in an eastern part of the lagoon; other communities situated on or in the lagoon include Jacqueville and the village of Tiagba. The Komooé River provides the main input of fresh water. In winter the lagoon becomes salty, but it turns to fresh water during the summer rainy reason. The levels of pollution in the lagoon have been moderately high for some years due to discharge of untreated industrial effluents and sewage from the nearby urban areas.