SDCL § 7-1-14: Clay County boundaries.

Beginning at the northeast corner of township ninety-five north of range fifty-one west of the fifth principal meridian, thence west and along the township line between townships ninety-five and ninety-six north to the northwest corner of township ninety-five north of range fifty-three west; thence south and along the range line between ranges fifty-three and fifty-four west, as extended, to the boundary line between the states of South Dakota and Nebraska; thence southeasterly and along said state line to the range line between ranges fifty and fifty-one west, as extended; thence north and along said range line to the place of beginning.