Beginning at the southwest corner of township one hundred fifty-eight north, range eighty-six west of the fifth principal meridian; thence east along the line between townships one hundred fifty-seven and one hundred fifty-eight north to the southeast corner of township one hundred fifty-eight north, range eighty-one west; thence north along the line between ranges eighty and eighty-one west to the northeast corner of township one hundred fifty-eight north, range eighty-one west; thence west along the line between townships one hundred fifty-eight and one hundred fifty-nine north to the southeast corner of township one hundred fifty-nine north, range eighty-four west; thence north along the line between ranges eighty-three and eighty-four west to the northeast corner of township one hundred sixty north, range eighty-four west, a point on the fifteenth standard parallel; thence west along the fifteenth standard parallel to the southeast corner of township one hundred sixty-one north, range eighty-four west; thence continuing north along the line between ranges eighty-three and eighty-four west, to the international boundary line between Canada and the United States; thence west along the international boundary line to the line between ranges eighty-seven and eighty-eight west; thence south along the line between ranges eighty-seven and eighty-eight west to the southwest corner of township one hundred sixty-one north, range eighty-seven west, a point on the fifteenth standard parallel; thence east along the fifteenth standard parallel to the northwest     corner of township one hundred sixty north, range eighty-six west; thence south along the line between ranges eighty-six and eighty-seven west to the point of beginning.