Flēvo, ōnis, m.,
the Zuyder Zee , a lake at the mouth of the Rhine , Mel. 3, 2 fin. ; called also Flēvom (sc. ostium), Plin. 4, 15, 29, § 101.
FLEVO LACUS and FLEVUM OSTIUM. Drusus, the son of Livia, and the brother of Tiberius, when he held a...
Dictionary of Greek and Roman Geography