Buford Sink is a freshwater cave and cavern site located in Crystal River, United States. Access requires a 400-metre walk from the parking area to the spring, where a small platform serves as the entry point. The site is suited for advanced divers and experienced free divers, featuring depths ranging from 14 to 21 metres. Divers should be prepared for an overhead environment and variable visibility between 5 and 30 metres. Currents are generally mild, though the site presents hazards including significant depth and low visibility. Typical dives last approximately 45 minutes. Due to the technical nature of the cave system, this site is recommended for experienced divers only.

Eagle's Nest is a submerged karst cave system in Crystal River, Florida, known for its extreme technical demands. The site features a shallow basin at 21 metres that leads into a vertical shaft descending to 95 metres. Divers encounter strong currents and variable visibility between 10 and 30 metres. Due to the significant depth and overhead environment, this site requires full cave certification and precise decompression planning. A thermocline is present, with surface waters warmer than the depths. Facilities at the shore entry point include parking and toilets. Divers must manage risks including nitrogen narcosis, entanglement, and decompression obligations throughout the 45-minute average dive duration.

King's Spring is a cave dive site located in the freshwater spring system of Crystal River. The site features depths ranging from 5 to 20 metres, with an average depth of 10 metres. Divers experience mild currents and visibility typically between 5 and 10 metres, though conditions can shift. Access is by boat only, requiring careful attention to surface boat traffic. The water temperature remains a constant 22 degrees Celsius year-round. Species recorded around this area include West Indian manatee, Atlantic tarpon, drum, croaker, whiptail stingray, Atlantic spadefish, toadfish, snake eel, honeycomb cowfish, spotfin burrfish, bream, needlefish, crab, slippery dick, and lizardfish. Air fills and a dive shop are available.

King Spring is a cavern site located at the head of Crystal River. As the largest spring-head in Kings Bay, it features a diameter of 60 metres and reaches depths of up to 20 metres, with an average depth of 8 metres. Divers and snorkellers can expect mild currents and visibility ranging from 2 to 11 metres. The water temperature remains a constant 22 degrees Celsius year-round. Access to the site requires a boat, which can be rented at a nearby dive shop or brought privately. Hazards include boat traffic, potential entanglement, and variable visibility. Facilities at the site include air fills, parking, and guided tours.

Joe’s Sink in Crystal River is a freshwater cavern dive offering depths ranging from the surface to 18 metres. Divers enter directly from the shore into a system characterised by mild currents and visibility typically around 6 metres. The environment features dense aquatic plants, which present an entanglement risk, requiring careful buoyancy control and gear management. Divers should remain within the light zone and avoid disturbing the silt to maintain visibility. The site is suitable for beginners with an open water certification, though the variable visibility and cavern topography require attention. The habitat supports various freshwater fish and invertebrates, though specific species sightings are not confirmed.

American Pro in Crystal River offers a diverse underwater environment ranging from 3 to 36 metres. This site features a combination of open reef, cavern, and cave sections, often experienced as a drift dive due to strong currents. With visibility reaching 60 metres, the site requires advanced buoyancy control and the ability to navigate shifting water movement. Shore entry provides access to the area, which is supported by full facilities including air fills, equipment rental, and showers. Due to the significant vertical profile and overhead environments, this site is suited for intermediate divers with appropriate technical training for cave and cavern sections.

Three Sisters Springs in Crystal River is a natural spring system serving as a warm-water refuge. The site features depths ranging from 1 to 18 metres and is accessible via shore entry. Visibility varies significantly, fluctuating between 5 and 30 metres depending on conditions. The water maintains a consistent temperature of 23°C throughout the year. This location is suitable for beginners and accommodates both diving and snorkelling activities. Facilities available on-site include parking, toilets, showers, changing rooms, rinse stations, and equipment rental. Guided tours and boat charters are also available for those exploring the area.

Crystal River offers shallow, shore-entry snorkelling in depths ranging from 1 to 4 metres. The site features seagrass beds and artificial reef structures, providing a habitat for species including West Indian manatee, Atlantic tarpon, whiptail stingray, bream, needlefish, crab, mullet, large mouth bass, snail, blue gill, and livebearer. Conditions are generally mild, though visibility can fluctuate between 1 and 15 metres. Beginners are well-suited to this environment, which is accessible without certification. Snorkellers should remain vigilant regarding boat traffic in the area. Facilities available at the site include parking, showers, and guided tours.