Big Stone Lake
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Big Stone Lake,narrow lake, c.25 mi (40 km) long, on the Minn.–S.Dak. line. Located in the outlet channel of glacial Lake AgassizAgassiz, Lake
, glacial lake of the Pleistocene epoch, c.700 mi (1,130 km) long, 250 mi (400 km) wide, formed by the melting of the continental ice sheet beginning some 14,000 years ago; it eventually covered much of present-day NW Minnesota, NE North Dakota, S Manitoba, central
..... Click the link for more information. , it is the source of the Minnesota River and serves as a storage reservoir for the Minnesota Valley.