en_tn_lite_do_not_use/psa/104/008.md

The mountains rose, and the valleys spread out

Here the psalmist speaks of God causing the mountains and valleys to move and change as if they chose to move themselves. They are described this way to emphasize God's power. (See: rc://en/ta/man/translate/figs-personification)

for them

The word "them" refers to the waters.