downriver

Short definition from Wiktionary

Adjective

1. 1
   Closer to the mouth of a river

Adverb

1. 1
   Travelling in the direction of the river current.

Proper noun

1. 1
   A region of the Detroit metropolitan area in the U.S. state of Michigan south of Detroit, along the western shore of the Detroit River covering 18 municipalities, Allen Park, Brownstown Charter Township, Ecorse, Flat Rock, Gibraltar, Grosse Ile Township, Huron Charter Township, Lincoln Park, Melvindale, River Rouge, Riverview, Rockwood, Romulus, Southgate, Taylor, Trenton, Woodhaven and, Wyandotte