Tenn. Code Ann. § 5-1-119

Counties, by resolution of their respective legislative bodies, may condemn property, real or personal, or any easement, interest, or estate or use therein, for present or future public use, either within or without the county, in accordance with the terms and provisions of title 29, chapter 16, or in any other manner provided by law, except that a county may not condemn property located outside of the county without receiving the approval of the county legislative body of the county wherein the land proposed to be taken for public use is located.