Rainbow River State Park, Florida

The Rainbow River is located in Dunnellon, Florida, USA, in the southwest corner of Marion County, about 20 miles southwest of Ocala, 100 miles  northwest of Orlando and 100 miles  north of the Tampa Bay area. Rainbow Springs and the Rainbow River became popular in the late 1880s when hard rock phosphate was discovered in the area. A small community called Juliette flourished near the springs during this "boomtown" era. In the 1930s the spring was developed as a tourist attraction.  Source