Narrow lake astride the Canadian-U.S. border, between Minnesota and northwestern Ontario. Rainy Lake is about 50 mi (80 km) long and has an area of 360 sq mi (932 sq km). Its shores are irregular and deeply indented, and it contains more than 500 islands. The region is the site of several Indian reservations and is popular for hunting, fishing, and canoeing.
Learn more about Rainy Lake with a free trial on Britannica.com.