noun
- the bottom of a river channel where water flows or has flowed
Examples
- The drought exposed the rocky riverbed for the first time in decades.
- Archaeologists discovered ancient pottery fragments in the dry riverbed.
- Fish were stranded in shallow pools when the riverbed became visible.
- The riverbed was covered with smooth stones and pebbles.
- Heavy rains caused the water to rush over the muddy riverbed.
- Geologists studied the sediment layers in the exposed riverbed.