Lewis & Short

rē-stagno, āre, v. n., to run over, overflow; of bodies of water: paludes restagnantes, Liv. 44, 46, 5: ostium amnis, id. 44, 6, 15; Plin. 5, 5, 5, § 34: restagnantis fecit maris unda paludem, Ov. M. 11, 364: flumen, Luc. 4, 89: palus, Sil. 8, 382; Col. 2, 12, 5; 8, 15, 3.
Transf., of the inundated place: late is locus restagnat, is overflowed, Caes. B. C. 2, 24 fin.; cf.: arva palude, Sil. 4, 752.