debouchure

plural debouchures · alternative débouchure

1. The outward opening of a river, creek, valley, or strait.

   The bluffs of the Missouri are often clothed with vegetation as far as the debouchure of the Platte River.

   1862, Richard Francis Burton, The City of the Saints, Chapter 1

   1 more example

   Garay's project met with approval. It included an extensive system of navigable canals and irrigating ditches, all discharging into main arteries connected with the last collector, the grand canal, which was to have its debouchure at the Ametlac tunnel.

   (Can we date this quote?), Bancroft History of Mexico

   Synonyms: debouchment, mouth