Beginning at the southwest corner of township one hundred thirty-eight north, range ninety west of the fifth principal meridian; thence east along the line between townships one hundred thirty-seven and one hundred thirty-eight north to the northwest corner of township one hundred thirty-seven north, range eighty-seven west; thence south along the line between ranges eighty-seven and eighty-eight west to the southwest corner of township one hundred thirty-seven north, range eighty-seven west, a point on the ninth standard parallel; thence east along the ninth standard parallel to the northwest corner of township one hundred thirty-six north, range eighty-four west; thence south along the line between ranges eighty-four and eighty-five west to the southwest corner of township one hundred thirty-four north, range eighty-four west; thence east along the line between townships one hundred thirty-three and one hundred thirty-four north to the northwest corner of township one hundred thirty-three north, range eighty-two west; thence south along the line between ranges eighty-two and eighty-three west to the southwest corner of township one hundred thirty-three north, range eighty-two west, a point on the eighth standard parallel; thence east along the eighth standard parallel to the point where the eighth standard parallel intersects the main channel of the Cannonball River; thence in a northeasterly direction along the main channel of the Cannonball River to the main channel of the Missouri River; thence in a northerly direction along the main channel of the Missouri River to the intersection of the tenth standard parallel with the main channel of the Missouri River; thence west along the tenth standard parallel to the northwest corner of township one hundred forty north, range ninety west; thence south along the line between ranges ninety and ninety-one west to the point of beginning.