Donut is a shallow reef site at Alligator Reef, United States, featuring depths ranging from the surface to 8 metres. The topography consists of a mix of boulder and branching coral structures, providing varied terrain for exploration. This site is suitable for beginners and is accessed by boat. Conditions are generally manageable with mild currents, though visibility can be highly variable. Divers and snorkellers should exercise caution regarding sea urchins present on the reef substrate. Avoid placing hands or feet on the seabed to prevent injury from spines while navigating the shallow areas. Always check local visibility reports before departure.

Kylie's Reef at Alligator Reef is a shallow marine site suitable for both divers and snorkellers. The reef structure sits at an average depth of 6 metres, with a range of 5 to 6 metres. Divers can observe various coral formations, including symmetrical brain coral, knobby brain coral, massive starlet coral, and elliptical star coral. The site supports a population of reef fish and invertebrates, such as crustaceans. Visibility typically ranges from 12 to 18 metres, and the area experiences mild currents. Access to this site is by boat only, and early morning departures are recommended for calmer surface conditions.

Jumping Mackerel is a marine dive site located at Hen and Chickens Reef in the United States. The site features a consistent depth of 10 metres. Access to this location is by boat only. Divers should be aware of moderate currents and potential boat traffic in the area. Given the depth and conditions, the site is suitable for beginner divers. Water temperatures at this location range between 24C and 30C throughout the year.

The Queen of Nassau is a wreck and artificial reef located 8046 metres from shore near Hen and Chickens Reef. This technical dive site sits at a depth of 70 metres. Due to the significant depth, strong currents, and potential for low visibility, this site is reserved for experienced technical divers. Boat access is required to reach the location. Water temperatures range from 21C to 27C throughout the year, and the cold conditions at depth necessitate the use of dry suits, hoods, and heavier gloves for thermal protection. Guided tours and boat charters are available to facilitate access to this deep-water wreck.

Good Patches at Hen and Chickens Reef offers a combination of natural and artificial reef structures. The site reaches depths between 7 and 25 metres, with an average depth of 15 metres, making it suitable for beginner divers. Navigation is straightforward due to mild currents, and visibility typically ranges from 10 to 30 metres. Divers should exercise caution regarding sharp coral and rocks when navigating the structures and remain aware of jellyfish in the water column. Access to this site is by boat only, with a typical dive duration of 50 minutes. Water temperatures remain between 23 and 29 degrees Celsius throughout the year.

Crater is a reef site located at Hen and Chickens Reef, accessible only by boat. The site features depths ranging from 11 to 18 metres, with an average depth of 14 metres. Divers should be prepared for moderate currents and potential surge, as well as hazards including boat traffic and sharp coral. Visibility varies significantly, ranging from 10 to 60 metres. This site is suitable for intermediate divers and supports night diving, with typical dive times around 40 minutes. Species recorded around this area include nurse sharks, great barracuda, wrasses, blue tang, and various angelfish species, alongside purple sea fans.

Morada is a shallow reef located 2000 metres offshore at Hen and Chickens Reef. The site features a depth range of 6 to 8 metres, making it suitable for beginner divers. Divers access the reef exclusively by boat. Visibility typically ranges from 10 to 25 metres, allowing for clear observation of the reef structure. A moderate current is common, so timing dives for slack or early flood tide is recommended to manage water movement. Facilities including air fills, equipment rental, and guided tours are available. Be aware that sharks are present in this reef environment, and divers should maintain a calm distance if encountered.

Hen and Chickens Reef consists of isolated patch reefs located approximately 3218 metres offshore from Islamorada. These reef structures, which vary in shape from round to oval, rise from the seabed and are surrounded by sand. The site is suitable for beginners and is often used for introductory scuba training. Divers can expect depths ranging from 6 to 9 metres, with an average depth of 7 metres. Access is by boat only. Conditions include mild currents and visibility typically between 5 and 15 metres. Water temperatures fluctuate between 24C and 30C throughout the year. Hazards include jellyfish, sharp coral, and surge.