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The following information was pulled from Wikipedia:
The Warm Mineral Springs (also known as Warm Salt Springs) is a water-filled sinkhole located in North Port, Florida, a mile north of U.S. 41. The primary water supply is a spring vent deep beneath the pool’s water surface. The site has functioned as a spa since the 1960s, and is an important geological and archaeological site. It was added to the U.S. National Register of Historic Places on November 28, 1977.
Warm Mineral Springs is the only warm water mineral spring in the State of Florida.









