Blue Spring State Park covers more than 2,600 acres, including the largest spring on the St. Johns River. Blue Spring is a designated Manatee Refuge and the winter home to a growing population of West Indian Manatees. During manatee season, which approximately runs from mid-November through March, several hundred manatee can be viewed atop the spring’s overlooks. The spring and spring run are closed to all water activity while manatees are present during this time. Swimming or diving with manatees is not permitted; this rule is strictly enforced.