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High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Grazing marsh is the term used in the British Isles for flat, marshy grassland in polders. It consists of large grass fields separated by fresh or brackish ditches, and is often important for its wildlife.Grazing marsh was created from Medieval times by building sea walls (earth banks) across tidal mudflats and salt marsh to make polders (although the term "polder" is little used in Britain). Polders in Britain are mostly drained by gravity, rather than by active pumping the original tidal drainage channels were augmented by new ditches, and flap valves in the sea walls allow water to drain out at low tide, but prevent the sea or tidal river from entering at high tide. The process of constructing polders in this way is called inning or reclaiming from the sea.