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Iliamna (Ĭlēăm´nə), lake, c.1,000 sq mi (2,590 sq km), 75 mi (121 km) long and up to 22 mi (35 km) wide, SW Alaska, at the base of the Alaska Peninsula; largest lake in Alaska and the second largest freshwater lake wholly within the United States. It is fed by many lakes and streams; the Kvichak River drains it SW into Bristol Bay. The lake is noted for sport fishing. Iliamna, Newhalen, and Kakhonak are the chief lakeside villages.