The story
From river + bed. Compare Dutch rivierbedding (“riverbed”), German Flussbett (“riverbed”), Swedish flodbädd (“riverbed”).
Etymology from Wiktionary, CC BY-SA 4.0.
riverbed
riv·er·bedToday it means: The path where a river runs, or where a river once ran; the bottom earthen part of a river, not including the riverbanks. Full definition →