The Preserve protects over 720,000 acres (2,913 km²) of freshwater swamp essential to the health of the Everglades ecosystem. *'''Oasis Visitor Center''', US Route 41, 50 miles west of Miami and 50 miles east of Naples. Daily 9AM-4:30PM except Christmas (Off-Road Vehicle Permit Office, 9:AM-3:30PM). ORV inspections are conducted Friday through Monday. The visitor center offers exhibits related to the natural and cultural history of the preserve, educational materials and an introductory film to the preserve, its resources and recreational opportunities. Staff is available to assist visitors with information about activities.