Sally Ward Spring is a technical cave and cavern site in Northwest Florida Springs, United States. The system features depths ranging from 3 to 20 metres. Divers access the site via a shore entry with on-site parking. The environment is defined by its overhead nature, requiring full cave certification and disciplined gas management. Visibility fluctuates between 6 and 21 metres depending on flow and penetration depth. Divers must maintain strict buoyancy control to prevent silting in the confined passages. Redundant lighting is necessary for navigating beyond the cavern zone, where passages become completely dark. The site is suitable only for expert divers due to the overhead environment and variable visibility.

Harvey's Cave is a technical shore-entry cave system in Northwest Florida Springs, reaching depths between 20 and 73 metres. The site presents a challenging overhead environment characterised by strong currents and variable visibility ranging from 1 to 18 metres. Water temperatures fluctuate between 13 and 25 degrees Celsius, with a warm halocline noted at 49 metres. Due to the significant depth, entanglement risks, and complex navigation, this site is strictly for advanced divers with formal cave certification. Divers must maintain precise buoyancy control and monitor gas supplies closely. Night diving is possible for qualified teams, though the hazard profile increases significantly in low-light conditions.

Spanish Hole is a historic wreck site situated near the mouth of the St. Marks River within the St. Marks National Wildlife Refuge. This site requires boat access and is suited for advanced divers due to moderate currents, potential for low visibility, and entanglement hazards. The environment features a mix of freshwater and saltwater influences. Divers may encounter common species including horseshoe crabs, crabs, and hermit crabs. Less frequently, whiptail stingrays, drum, croaker, bream, and livebearers are recorded. Pufferfish and mullet are rare sightings, while snails are very common. Water temperatures fluctuate significantly throughout the year, ranging from 14C in January to 32C in July and August.

Little Blue Spring is a freshwater shore-entry snorkel site in the United States. The site features a spring vent reaching depths of 13 metres, though most snorkellers remain in the shallower sections. A mild current makes the site suitable for beginners. Underwater, the habitat supports various freshwater fish and invertebrates. Visitors should exercise caution regarding entanglement risks from submerged tree roots and aquatic vegetation near the spring vent. The site offers full facilities including parking, toilets, showers, changing rooms, and a cafe, allowing for convenient access. Water temperatures fluctuate between 13C and 32C throughout the year, and visibility can vary significantly between visits.