S.D. Codified Laws § 7-1-15
Beginning at the northeast corner of township one hundred nineteen north of range fifty-one, west of the fifth principal meridian, thence west along the township line between townships one hundred nineteen and one hundred twenty north, across the former Sisseton and Wahpeton Indian Reservation in the same course, and continuing in the same course to the northwest corner of township one hundred nineteen north of range fifty-five; thence south and along the range line between ranges fifty-five and fifty-six west, to the southwest corner of township one hundred sixteen north of range fifty-five west; thence east and along the township line between townships one hundred fifteen and one hundred sixteen north, to the southeast corner of township one hundred sixteen north of range fifty-one west; thence north and along the range line between ranges fifty and fifty-one west, to the place of beginning.
SDCL 7-1-15