A coast, shore, or bank.
[Middle English, from Old French, from rive, bank, from Latin rpa.]
The American Heritage® Dictionary of the English Language, Fourth Edition copyright ©2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
“Mushrooms of orange and green smoke blossomed on both banks, drifting like jellyfish on the breeze. Both sides launched chemical bombs from growling engines that stalked the rivage.”
–from The Last Page by Anthony Huso