noun, noun which may take the genitive case particle 'no'
downstream; lower reaches
Refers to the downstream area of a river, or the direction toward the mouth. Often used in contrast with 川上 (upstream).
See also: 川上
There is a small village downstream on this river.
The downstream area needs to be careful about flooding.
We let the boat drift downstream from the bridge.
The fallen leaves floated away downstream.