SDCL § 7-1-56: Sanborn County boundaries.

Beginning at the northwest corner of township one hundred eight north of range fifty-nine, west of the fifth principal meridian, thence west and along the second standard parallel north to the northwest corner of township one hundred eight north of range sixty-two west; thence south and along the range line between ranges sixty-two and sixty-three west, to the southwest corner of township one hundred five north of range sixty-two west; thence east along the first standard parallel north, to the southeast corner of township one hundred five north of range fifty-nine west; thence north and along the range line between ranges fifty-eight and fifty-nine west, to the place of beginning.