Karst spring
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A karst spring or karstic spring is a spring that is part of a karst hydrological system.
A 130-metre (430 ft) deep karst spring of the Cetina River in Croatia
The Vrelo Bune (English: Wellspring of the Buna) with the Blagaj Tekke under a limestone cliff in Bosnia
Blautopf (Blue Pot), karst spring of the River Blau (River Blue) in Blaubeuren, Swabian Jura
Fontaine-de-Vaucluse, karst spring of the Sorgue, characterised by an upward movement of water from the depth of over 315 metres (1,033 ft)
Spring (hydrology)
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A spring is a natural exit point at which groundwater emerges out of the aquifer and flows onto the top of the Earth's crust (pedosphere) to become surface water. It is a component of the hydrosphere, as well as a part of the water cycle. Springs have long been important for humans as a source of fresh water, especially in arid regions which have relatively little annual rainfall.
On an average day nearly 303 million US gallons (1,150,000 m3) of water flow from Big Spring in Missouri at a rate of 469 cubic feet per second (13.3 m3/s).
Grand Prismatic Spring, Yellowstone National Park, Wyoming
A natural spring on Mackinac Island in Michigan
Sunrise at Middle Spring, Fish Springs National Wildlife Refuge, Utah