A range of spectacular high dunes and long sand valleys landlock Saudi Arabia. Different types of dunes develop into all shapes and sizes:
Crescent Dunes - is shaped like a crescent and is the most common type of dune. Formed by winds blowing in one direction, these dunes are wide rather than long.
Linear Dunes - With ridges as their prominent feature, the Linear Dunes are straight, long, and usually separated by other sand or rocky terrain.
Dome-Shaped Dunes- Dome-shaped dunes are low circular-shaped dunes that lack a slip face due to the winds' instability.
Star Shaped - When the wind blows from all directions, the Star Sand is accumulated like a pyramid-shaped mound growing upward.