Jetboard (hydroflight sports)
In hydroflight sports, a jetboard is a device that uses water propulsion as its means of flying above the surface of any body of water. In jetboarding, the athlete is standing in wakeboard-style boots/bindings which are attached to a board or independent base plates with jets extending downward from under the feet.
Source: Wikipedia — Jetboard (hydroflight sports) (CC BY-SA 4.0)