Beginning at the point where the boundary line between the states of North Dakota and Montana intersects the seventh standard parallel; thence east along the seventh standard parallel to the southeast corner of township one hundred twenty-nine north, range ninety-nine west of the fifth principal meridian; thence north along the line between ranges ninety-eight and ninety-nine west to the northeast corner of township one hundred thirty-two north, range ninety-nine west, a point on the eighth standard parallel; thence west along the eighth standard parallel to the boundary line between the states of North Dakota and Montana; thence south along said boundary line to the point of beginning.