The Rainbow River in Dunnellon, Florida, is world-famous for its crystal-clear turquoise waters and its status as one of the largest first-magnitude spring systems in the state. Fed by the headsprings at Rainbow Springs State Park, the river discharges over 400 million gallons of 72∘F (22∘F) water every day, maintaining a constant temperature and remarkable visibility year-round. It is primarily known as a premier destination for recreational tubing, where visitors can enjoy a leisurely four-hour float downstream through lush, prehistoric-looking scenery. The river is also a haven for snorkeling, kayaking, and diving, as the clear water allows for easy viewing of abundant wildlife, including turtles, otters, alligators, and various fish species. Historically, the area was a private attraction in the mid-20th century featuring a monorail and "submarine" boats; today, it is protected as a National Natural Landmark and an Outstanding Florida Water. The river’s "KP Hole" park is the most popular entry point for those looking to experience the serene, slow-moving current and the "boiling" sand vents where water bubbles up from the Floridan Aquifer below.