Ezekiel 32:5

And I will lay thy flesh upon the mountains, and fill the valleys with thy height.

Cross-reference

Ezekiel 35:8 explicitly fills mountains with slain—strong verbal and thematic echo of laying flesh on mountains here.

In Ezekiel 39:4, a similar judgment against Gog leaves bodies on mountains for birds and beasts, echoing the fate of Pharaoh's army here.

Isaiah 34:3 Parallel

Isaiah 34:3 says mountains will be covered with corpses—direct parallel to laying flesh on mountains in this verse.