flat (n.)
low-lying land, plain, swampy ground
Cym III.iii.11[Belarius to Guiderius and Arviragus] I'll tread these flats
Ham IV.v.102[Messenger to Claudius] The ocean ... / Eats not the flats with more impiteous haste [i.e. affected by tide]
Tem II.ii.2[Caliban alone] All the infections that the sun sucks up / From bogs, fens, flats
SHAKESPEARE'S WORDS © 2020 DAVID CRYSTAL & BEN CRYSTAL