But the moment came when they reached a deep pool with vertical walls on either side.

The canyon was so narrow it didn't take them long to reach the vertical wall.

The vertical walls were flowing up on either side of him.

About thirty hanging seconds and I was onto the vertical wall.

We came to a series of circular mirrors standing against the vertical wall to our left.

From there around the northern end, the island had no beach, but a vertical wall of stone.

She could make out the tops of trees growing from one vertical wall.

They often hunt high up in bushes, or on vertical walls.

The wide wings were flat against a vertical wall of air.

The trail led through a break in that vertical red wall.