S.D. Codified Laws § 7-1-19
Beginning at a point where the township line between townships one hundred nineteen and one hundred twenty north intersects the range line between ranges fifty-two and fifty-three west, according to the survey of the former Sisseton and Wahpeton Indian Reservation, thence north and along said range line to the northeast corner of township one hundred twenty-four north of range fifty-three west, according to said survey; thence west and northwesterly along the township line between townships one hundred twenty-four and one hundred twenty-five north, across said former reservation in the same course, to the northwest corner of township one hundred twenty-four north of range fifty-nine west of the fifth principal meridian; thence south and along the eighth guide meridian west to the southwest corner of township one hundred twenty north of range fifty-nine west; thence east and along the township line between townships one hundred nineteen and one hundred twenty north, to the place of beginning.
SDCL 7-1-19