'Clefts' in the Bible

To go into the caverns of the rocks, and into the clefts of the ragged rocks, from before the terror of Yahweh, and from the glory of his majesty, when he arises to shake the earth mightily.

They shall come, and shall all rest in the desolate valleys, in the clefts of the rocks, on all thorn hedges, and on all pastures.

you who inflame yourselves among the oaks, under every green tree; who kill the children in the valleys, under the clefts of the rocks?