Blue Spring State Park is a state park locate west of Orange City, Florida in the United States. The park is a popular tourist destination; available activities include canoeing, SCUBA diving, kayaking, fishing, camping, hiking, wildlife watching, and swimming. The spring is the largest on the St. Johns River and serves as the winter home of many Florida manatees that come up the St. Johns to bask in the relatively warm waters (constant 72 Fahrenheit/21 Celsius) of the springs. Millions of gallons of clear water flow from the spring daily to join the St. Johns River.