What extreme sport involves riding down a sand dune with a board?

Sandboarding is an extreme sport that involves going down or riding down a sand dune with a board attached to your feet. Most people stand while riding a sand board though there are a few exceptions who ski the sand dunes while sitting on the sandboards. Sandboarding has been around since the 19th century. During those times, the sport was practiced by the ancient kings.

Source: Savvy Escapade