Lewis & Short

myrtētum (murtētum), i, n. (collat. form, myrtēta, ae, f., Plaut. Fragm. ap. Prisc. p. 625 P.) [myrtus], a place full of myrtles, a myrtle-grove: quasi pineis murteta item ego vos virgis circumvinciam, Plaut. Rud. 3, 4, 27: collis vestitus oleastro ac murtetis, Sall. J. 48, 3: litora myrtetis laetissima, Verg. G. 2, 112.
In the neighborhood of Baiae there was such a myrtle-grove, where a warm, sudorific vapor rose from the earth, Cels. 2, 17; cf. id. 3, 21; Hor. Ep. 1, 15, 5.