Minnesota North Dakota South Dakota Tripoint, Minnesota

This is one of 35 points in the USA where three state lines meet on land (another 27 are in water). This point, where Minnesota, North Dakota, and South Dakota meet is not commemorated. The north/south line dividing Minnesota from the Dakotas is supposed to be the small, meandering Bois de Sioux River, and east/west line dividing the Dakotas is supposed to meet Minnesota in the river. But 19^th century surveying variables, and a meandering and engineered river puts the tripoint 500 feet or so west of the river.