swale

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[edit] English

Possibly from Middle English, "shade", perhaps of Scandinavian origin; akin to Old Norse svalr

swale (plural swales)

A low tract of moist or marshy land.
A long narrow and shallow trough between ridges on a beach, running parallel to the coastline.
A shallow troughlike depression that's created to carry water during rainstorms or snow melts; a drainage ditch.
A shallow, usually grassy depression sloping downward from a plains upland meadow or level vegetated ridgetop.
A shallow trough dug into the land on contour (horizontally with no slope). Its purpose being to allow water time to percolate into the soil.

low tract of moist or marshy land

long narrow and shallow trough between ridges on a beach

shallow troughlike depression created to carry water

shallow depression sloping downward from a meadow