Riverbed
River Bottom
noun
The river bottom is the river bottom, also known as the riverbed.
The readings are the readings you learned with the kanji. Just don't forget the rendaku for 底!
川底には水草がたくさん生えていました。
There were many aquatic plants growing on the river bottom.
この川は川底が見えるほどキレイな川です。
This river is so clean that you can see the river bottom.
彼は、川底でジッとしている大きな石のような男です。
He's like a big stone sitting still at the bottom of a river.