In geomorphology, an antidune is a special type of sand dune that forms on the downstream side of a water flow.

Geomorphology is the science that studies the surface shape of the earth.

He couldn't sleep, turning over in bed repeatedly.

He turned over in bed several times while sleeping.

There is a lot of sand on the beach.

If you plant this seed, beautiful flowers will bloom.

We set up camp downstream of the river.

The water current of this river is very fast.

We love climbing the dunes.

He was standing on the side of the road.