A whirlpool is a body of swirling water produced by the meeting of opposing currents. Vortex is the proper term for any whirlpool that has a downdraft. In narrow straits, with fast flowing water, whirlpools are normally caused. Smaller whirlpools also appear at the base of many waterfalls and can also be observed downstream from manmade structures such as weirs and dams. Natural river, stream, brook, creek. 4K UHD 3840×2160.