'Valleys' in the Bible

My friends have been false like a stream, like streams in the valleys which come to an end:

So as to set on the dust a defence, And on a rock of the valleys a covering.

To dwell in the clifts of the valleys, in caves of the earth, and in the rocks.

Like clay is molded by a signet ring, the earth's hills and valleys then stand out like the colors of a garment.

Canst thou bind the unicorn with his band in the furrow? or will he harrow the valleys after thee?