What does erg mean? an area of shifting sand dunes

a deep inlet between high cliffs

What does savannah mean? a grassy plain in tropical and subtropical regions

a desert

What does rillet mean? a very small stream

a sand dune

What does sowback mean? a low ridge of sand

a long mountain ridge with steep sides

What does vale mean? a plateau

a valley

What does tor mean? a hill or rocky peak

a flat strip of land

What does tributary mean? a dry watercourse or ravine

a river flowing into a larger river or lake

What does pindan mean? a luxuriant, dense forest

arid, sandy country

What does nullah mean? a mountain chain

a watercourse, riverbed, or ravine

What does seif mean? a sand dune

a fertile spot in a desert