An Etymological Dictionary of Astronomy and Astrophysics

A long, narrow region of low land between ranges of mountains, hills, or other high areas, often having a river or stream running along the bottom.

Etymology (EN): M.E. valeie, valey, from O.Fr. valee “valley,” from V.L. *vallata, from L. vallis “valley,” of unknown origin.

Etymology (PE): Darré “valley,” from Mid.Pers. dar, darrak “ravine, cleft;” cf. Skt. pradará- “cleft.”