Lewis & Short

ad-jăcĕo, cŭi, no sup., 2, v. n., to lie at or near, to be contiguous to, to border upon (most freq. used of the geog. position of a place).
Constr. with dat., acc., ad, or absol. (in the histt. very freq.).

        1. (α) With dat.: Tuscus ager Romano adjacet, Liv. 2, 49, 9; mari, id. 26, 42, 4; Plin. 6, 17, 21, § 56; Front. Strat. 3, 9, 5: cum Romani adjacerent vallo, Tac. A. 1, 65: munitionibus, id. ib. 4, 48: adjacet undis moles, Ov. M. 11, 729: quae adjacent torrenti Jeboc, Vulg. Deut. 2, 37.
          Trop.: velle adjacet mihi, Vulg. Rom. 7, 18; 7, 21.
        2. (β) With acc.: gentes, quae mare illud adjacent, Nep. Tim. 2, 1: Etruriam, Liv. 7, 12, 6 (v. Alschefski and Weissenb. ad h. l.).
        3. (γ) With ad: ad Syrtim, Mel. 1, 7, 2; so perh. also Caes. B. G. 6, 33, 2: quae (regio) ad Aduatucos adjacet (for the lect. vulg. Aduatucos or Aduatucis), and id. B. C. 2, 1; v. adigo fin.
        4. (δ) Absol.: adjacet (via) et mollior et magis trita, Quint. 1, 6, 22: adjacente Tiberi, Tac. H. 2, 93; so, adjacentes populi, i. q. propinqui, contiguous, neighboring, Tac. A. 13, 55.
          And adjăcentĭa, ium, n., the adjoining country: lacum in adjacentia erupturum, Tac. A. 1, 79; 5, 14: projecto nitore adjacentia inlustrare, Plin. 37, 9, 52, § 137.