The river was reported to have steep sides and a rock bed.

And the river's dependency grows daily upon rainfall to cover its rock bed.

And when they walked a little further, the rock bed itself emerged from beneath the ice.

The rock bed on each side of the fjord is different.

There is a shallow grass and rock bed to the south of the islands.

The water thundered and ripped at its twisted rock bed.

Less than half the wells extend down to the rock bed.

The town was designed with two lines of buildings facing one another across the rock bed main street.

'There is no real rock bed until you get much further down,' he said.

Built on a single rock bed, it is noted for the symmetry of its features.