איוב ל:ו פירוש: רש״י

in the crevices of the valleys There is a salty land that splits, where they would lie in the holes in the earth and the holes in the crevices of the rocks.

and rocks Heb. וכפים, the Aramaic translation of סלעים, rocks. (Another explanation:) in the crevice of the streams That is the crevice that the stream makes around itself.