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Geologic Map
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Generalized Geologic Map of the Conterminous United States
North America Shaded Relief


  The North American Tapestry of Time and Terrain

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Legend and Rock Ages
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Political Boundaries


Northwest Angle

  close up of the Northwest 
Angle of northern Minnesota with political bordersThe Northwest Angle, a 150 square mile (390 square km) tract separated from the rest of Minnesota by the Lake of the Woods, is the northernmost point in the United States exclusive of Alaska. The peninsula is connected to Manitoba and can be reached overland only by going through Canada. It was acquired in the 1783 Treaty of Paris, the result of an earlier surveying error made while attempting to locate the headwaters of the Mississippi and other rivers. Most of the land is uninhabited and held in trust by the Red Lake Indian Reservation.