English Tidal flats in the Wadden sea Noun tidal flat (plural tidal flats) The bed of a tidal river, estuary, or shallow sea such as the Wadden Sea which is uncovered at low tide. Related terms mudflat riverbed seabed Translations bed of a tidal river Catalan: plana de marea f Chinese: Mandarin: 海塗/海涂 (zh) (hǎitú), 海涂 (zh) (hǎitú), 灘塗/滩涂 (zh) (tāntú), 滩涂 (tāntú) Finnish: vuorovesitasanne, vuorovesijättömaa French: vasière (fr) f German: Watt (de) n, Wattenmeer (de) n Irish: réileán taoid m Vietnamese: bãi triều (vi) Welsh: fflat llanw m Wikiwand - on Seamless Wikipedia browsing. On steroids.