SDCL § 7-1-40: Lake County boundaries.

Beginning at the northeast corner of township one hundred eight north of range fifty-one 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 fifty-four; thence south and along the range line between ranges fifty-four and fifty-five to the southwest corner of township one hundred five north of range fifty-four west; thence east and along the first standard parallel north, to the southeast corner of township one hundred five north of range fifty-one west; thence north and along the range line between ranges fifty and fifty-one, to the place of beginning.