Wiktionary
n. A recreational activity resembling snowboarding but performed on sand instead of snow.
Wikipedia
Sandboarding is a board sport similar to snowboarding. It is a recreational activity and takes place on sand dunes rather than snow-covered mountains. This boardsport has adherents throughout the world, most prevalently in desert areas or coastal areas with beach dunes.
It involves riding across or down a dune while standing with both feet strapped to a board, though some sandboarders use a board without bindings. It is less popular than snowboarding, partly because it is very difficult to build a mechanised ski lift on a sand dune, and so participants generally must walk back up to the top. Alternatively, they may ride a dune buggy or all-terrain vehicle back to the top of the dune. On the other hand, dunes are normally available year-round as opposed to ski resorts, which are usually seasonal.
Josh Tenge, professional sandboarding champion, holds the Guinness Book of World Records entry for the longest-distance back flip at 44' 10". Tenge is also a four-time world sandboarding champion and holds three world records. Erik Johnson, a professional snowboarder and sandboarder, holds the Guinness World Record for Speed on a Sandboard at . Unofficial speeds of have reportedly been clocked.