Trench
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A trench is a type of excavation or depression in the ground that is generally deeper than it is wide, and narrow compared with its length.
Depiction of the topography of the Puerto Rico Trench, the deepest part of the Atlantic Ocean
Automated trench digging on a street in Baku
Allied troops entrenched in the Battle of Tuyutí.
Ditch
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A ditch is a small to moderate trench created to channel water. A ditch can be used for drainage, to drain water from low-lying areas, alongside roadways or fields, or to channel water from a more distant source for plant irrigation. Ditches are commonly seen around farmland, especially in areas that have required drainage, such as The Fens in eastern England and much of the Netherlands.
Ditches at the Ouse Washes nature reserve.
Waterplants growing in a ditch in the Netherlands, showing Sagittaria sagittifolia to the right.
Major ditch of Sueca, Valencian Community