W. Va. Code § 1-3-4
From the plats showing the portion of each county to be included in the proposed new county, mentioned in section two of this article, a plat of the proposed new county shall be prepared under the joint supervision of the surveyors who made the plats of such portions, which plat shall bear the joint certificate of such surveyors as to the surveys included therein and shall show the courses and distances of the boundary line of such new county, and the streams and other natural objects or points on such boundary line, and a copy of the plat so certified shall be returned by the surveyor of each county to the clerk of the county court thereof. Such return shall be noted in the records of the county court and such copy shall be filed and preserved by such clerk in his office.
W. Va. Code § 1-3-4