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Vortex Spring is a cold, freshwater spring that produces approximately 28 million US gallons (110,000 m3) of water daily. The spring consists of a 200 ft (61 m) basin with sloping sides and an underground cave which links the spring to the Floridan aquifer. Water temperature is steady at 68 degrees Fahrenheit with no thermocline, and is typically very clear. The spring runoff flows into nearby Otter Creek, which joins Sandy Creek a short distance upstream of Ponce de Leon Spring. There are many fish in the spring; large carp swim in the basin while freshwater eels live in the cave. The cave has been measured to a total of 1,642 feet (500 m).
Vortex Spring is a popular diving area both for experienced and novice divers. Dive training is offered at the park. There are two underwater training platforms at 20 feet (6.1 m) which are often used for Open Water certification dives, and a "talk box" that divers swim into, allowing them to talk to each other while under the surface. The cavern entrance is at 58 feet (18 m) below the surface, and has an opening of 9' x 12'. A handrail is mounted along the wall of the cave. The cave is accessible to 310 feet (94 m), further passage is blocked by a steel grate. Experienced divers are allowed to dive to 115 feet (35 m).
At the site, many facilities are provided for visitors. A restaurant, lodging, dive shop, and changing rooms with heated showers are on site. Recreational features include diving boards, rope swings, and slides into the swimming area. Camping facilities, picnic areas, a basketball court, volleyball court, paddle boats, floats, and canoes are also provided.