For the purposes of determining the aggregate external boundary of an unincorporated area, all real property in the area to be annexed, which at the time the annexation procedures are initiated, (1) is unincorporated, and (2) is in the same county as the annexing municipal corporation, shall have its area included in determining the aggregate external boundary.
(Code 1981, §36-36-91, enacted by Ga. L. 1992, p. 2592, § 3.)