Queenstown, New Zealand, where jetboats are used extensively for adventure tourism, claims to be the jetboat capital of the world, and jetboats are very common for many coastal and riverine tourism activities in the country, such as the Excitor in the Bay of Islands.
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Both methods yield thrust due to Newton's third law— every action has an equal and opposite reaction.
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While designation as a wilderness area in the United States generally requires the prohibition of any motorized machinery, the use of jetboats (On the Main Fork of the Salmon River) and several airstrips are permitted in this wilderness as grandfathered existing uses before the wilderness was designated.