N.C. Gen. Stat. § 1-40: Twenty years adverse possession.

No action for the recovery or possession of real property, or the issues and profits thereof, shall be maintained when the person in possession thereof, or defendant in the action, or those under whom he claims, has possessed the property under known and visible lines and boundaries adversely to all other persons for 20 years; and such possession so held gives a title in fee to the possessor, in such property, against all persons not under disability. (C.C.P., s. 23; Code, s. 144; Rev., s. 384; C.S., s. 430.)