Kan. Stat. § 18-146
The county of Johnson is bounded as follows: Commencing at the point where the north line of township twelve south intersects the west boundary line of the state of Missouri; thence west on said township line, to its intersection with the main channel of the Kansas river in range twenty-four east; thence up said river, in the middle of the main channel thereof, to an intersection with the line between the second and third tiers of sections in range twenty-one east; thence south on section lines, to the corner of sections fourteen, fifteen, twenty-two and twenty-three, in township fifteen south, of range twenty-one east; thence east on section lines, to the western boundary line of the state of Missouri; thence north on said boundary line, to the place of beginning.
K.S.A. 18-146