Horseshoe Beach at Sambo Reefs is an artificial reef site offering shore access for snorkellers. The site features a former quarry environment with a rocky perimeter and a deeper central area. Depths typically range from 2 metres to an average of 5 metres, though the centre can reach depths of approximately 9 metres. Conditions vary, and snorkellers should be aware of sharp coral present throughout the area. This site is suitable for beginners looking for a shore-based experience without the need for a boat.

The Horseshoe is a shallow reef site located within the Sambo Reefs, offering a manageable environment for newly certified divers. The reef structure sits at depths between 3 and 6 metres, with an average depth of 5 metres. Divers experience mild currents and visibility ranging from 3 to 10 metres. Access to this site is by boat only. When navigating the reef, maintain neutral buoyancy to avoid contact with the seabed and structures. Be aware of sharp rock and a submerged wreck present at the site. Water temperatures are warm throughout the year, fluctuating between 24 and 32 degrees Celsius.

Looe Key at Sambo Reefs features a combination of natural and artificial reef structures. The site topography ranges from shallow areas to a maximum depth of 32 metres, with an average depth of 5 metres. Access is by boat only, located approximately 9656 metres from shore. Conditions include moderate currents and visibility between 4 and 12 metres. Water temperatures fluctuate between 23C and 29C. Divers and snorkellers should be aware of hazards including jellyfish, sharks, sharp coral, and strong currents. A full exposure suit is recommended for protection. Guided tours are available to assist with navigating the currents and site layout.

Horseshoe Reef is a shallow marine reef located 1300 metres from the shore of Islamorada. The site features an average depth of 5 metres, with a range between 3 and 6 metres, making it suitable for beginners. Access to the reef is by boat only. Divers and snorkellers should be aware of potential hazards including boat traffic, sharp coral, surf, and strong currents. Conditions at the site are variable, with visibility typically ranging from 5 to 10 metres. Water temperatures fluctuate throughout the year, ranging from 24C in the winter months to 30C during the summer.

Marquesas Keys features a combination of natural reef and artificial structures located 16 kilometres from shore. The site ranges in depth from 5 to 30 metres, with an average of 15 metres, making it suitable for intermediate divers. Boat access is required, and divers should be prepared for moderate currents that can intensify at depth. Visibility varies between 5 and 25 metres. Hazards include jellyfish, sharks, sharp coral, and strong currents. Divers are advised to maintain buoyancy control and consider wearing gloves to protect against sharp surfaces. A typical dive lasts 45 minutes, and water temperatures range from 23C to 29C throughout the year.

Sombrero Reef is the largest reef in the Middle Keys, marked by a historic lighthouse. The site features a classic spur-and-groove topography with high coral relief. Divers and snorkellers can explore depths ranging from 2 to 35 metres, with an average depth of 20 metres. Marine life commonly observed includes Great Barracuda, Blue Tang, Stoplight Parrotfish, Purple Sea Fan, and various wrasses. Less frequently, visitors may encounter Queen Angelfish, French Angelfish, Hogfish, and Scrawled Filefish. Conditions are generally mild, though divers should remain aware of boat traffic and surge. The site is accessible only by boat and is suitable for beginners.

Looe Key is a reef system located at Sambo Reefs, United States, offering depths ranging from 3 to 30 metres with an average of 15 metres. Accessible only by boat, the site features mild currents and visibility between 6 and 30 metres. The reef structure consists of hard and soft corals. Divers should be aware of potential hazards including surge, swell, and strong currents. Water temperatures vary from 23C to 29C, though high temperatures in 2023 resulted in coral bleaching and mortality. The site is suitable for beginners and supports night diving, with guided tours and boat charters available locally.

Looe Key Reef is a prominent reef site located in the Lower Keys, named after the HMS Looe. The site features significant coral cover and is part of the Mission: Iconic Reefs initiative. Divers and snorkellers can explore depths ranging from 2 to 10 metres, with an average depth of 6 metres. Access to the site is by boat only, as it is situated approximately 9656 metres from the shore. Conditions vary, with visibility ranging from 6 to 30 metres and moderate currents. The site is suitable for beginners and supports night diving, with typical dive times around 60 minutes. Hazards include sharks, sharp coral, and strong currents.