Wiktionary
n. (plural of river bed English)
Usage examples of "river beds".
They approached a flat-topped hill between two ancient, long-dry river beds, the channels wide, their banks eroded to gentle slopes.
Their return to the mountain range took only eight days, and would have been quicker, except that they had to build the road for the all, motor vehicles through several rocky valleys and numerous dry river beds.
The similarity was such that Arabic words were slipping quickly into English, because Arabic had a larger vocabulary for this landscape: akaba for the steep final slopes around volcanoes, badia for the great world dunes, nefuds for deep sand, seyl for the billion year-old dry river beds.
And so the littered gullies and dried-out river beds of Starside's bottoms formed a monstrous ossuary.
The smugglers travel armed but they put their faith in speed, punishing both truck and passengers unmercifully as they roar through dry river beds and across long veldt-like plains oh a dirt track which no conventional car could ever navigate.
I will water the land with what flows from you, and the river beds shall be filled with your blood.