I had lots of fun there because it was really sandy and very soft. When I was coming down on the slope of the sand hill, if you pushed the sand a bit, it flows like water.
There are lots of sand dunes around the world like, northwest of India and in parts of the southwestern United States.
Dunes form when the sea wind pushes sand against an obstacle like grass or trees on the beach. Over time, it becomes a small hill of sand.