Riverboarding
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Riverboarding is a boardsport in which the participant is tethered to the shore while the river flows underneath their board. It is physically analogous to water skiing but instead of being pulled through the water, the water flows past the riverboarder. Elastic tethers allow for flexibility the location of the riverboarder. Fast flowing currents are preferred.
Riverboarding also refers to a recreational and rescue practice of using a high-flotation riverboard, designed for buoyancy in highly aerated water. As recreation, the board is used, untethered, for both travel downstream or ferrying across streamflow, and for 'surfing' hydraulics.
In rescue use, the board is used to support both rescuer and victim in the water during rescue. In rescue use the rescuer is often tethered to a control line, as in a "live-bait" rescue.
see: Swiftwater rescue