Transverse dunes are formed in areas where there are few obstructions such as plant life and rocks. A consistent wind mixed with an abundant supply of sand forms the transverse dunes at right angles. You can find these dunes in areas with arid conditions.
Many coastal dunes are transverse.
In the Sahara desert they can reach extensive heights of 200 meters. They are 1 to 3 kilometers wide and are 100 kilometers or more in length.