Planasĭa, ae, f., = Πλανασία,
an island in the Tyrrhenian Sea , south of Ilva ( Elba ), now Pianosa , Varr. R. R. 3, 6; Plin. 3, 6, 12, § 81; Tac. A. 1, 3; Mart. Cap. 6, § 644.
PLANA´SIA[LERINA; LERON.] ...
Dictionary of Greek and Roman Geography