SDCL § 7-1-2: Aurora County boundaries.

Beginning at the northeast corner of township one hundred five north of range sixty-three, west of the fifth principal meridian; thence west and along the township line between townships one hundred five and one hundred six, to the northwest corner of township one hundred five north of range sixty-six west; thence south along the range line between ranges sixty-six and sixty-seven to the southwest corner of township one hundred one north of range sixty-six west; thence east and along the base line to the southwest corner of township one hundred one north of range sixty-three west; thence north and along the range line between ranges sixty-two and sixty-three west, to the place of beginning.