Gebirge - (German) mountains, mountain range
Erg - (Arabic) dune, sandy desert
Hamada - (Arabic) rocky plateau
Chott - (Arabic) salt lake
Djebel - (Arabic) mountain
Nahr - (Arabic) river
Oued - (Arabic) river
Sahara - (Arabic) desert, plain
Sebkha - (Arabic) salt marsh

There's a start.