Examples from the Web for riverbed
They might build one bomb and test it in a riverbed a few miles away.
I now discovered the source of the beautiful pebbles which had so pleased me in the riverbed.The Malay Archipelago|Alfred Russell Wallace
The worst situation seems to be in the Columbia Riverbed System.The Thirst Quenchers|Rick Raphael
They'd let him down by a rope to find things on the bottom of the riverbed.Slave Narratives: a Folk History of Slavery in the United States From Interviews with Former Slaves|Work Projects Administration