Underwater Island at Anacapa Island is a reef and kelp forest site requiring boat access. Divers can expect depths ranging from 10 to 29 metres, with an average depth of 13 metres. Visibility typically spans 15 to 30 metres, though conditions vary with moderate currents and surge. Marine life recorded here includes common sightings of Spanish Shawl, scorpionfish, sea stars, and sea hares. Divers may also encounter uncommon species such as Garibaldi, Horn Shark, wrasses, Neptunazurea kempfi, and California Spiny Lobster. Rare sightings include California Sea Lion, California Moray, Lesser Two-spot Octopus, Sorcerer's Dorid, and Hermissenda. Due to cool water temperatures between 13C and 17C, a 7mm wetsuit is recommended year-round.

Inner Underwater Island is a reef and pinnacle site located off Anacapa Island. Divers typically experience depths around 7 metres, with dives lasting approximately 45 minutes. Access is by boat only, and the site is suited for intermediate divers due to moderate currents, surge, and variable visibility ranging from 6 to 24 metres. Marine life commonly observed includes Garibaldi, Spanish Shawl, Scorpionfish, sea stars, and sea hares. Divers may also encounter California Moray, Horn sharks, Hermissenda, Neptunazurea kempfi, California spiny lobster, brittle stars, tube worms, and abalone. Red gorgonians are also present on the reef structure.

Cathedral Cove at Anacapa Island offers diverse topography including reef, kelp forest, wall, drop-off, and pinnacle structures. Divers can explore depths between 7 and 27 metres, with an average depth of 15 metres. Visibility ranges from 10 to 30 metres. This site requires boat access and is suited for intermediate divers due to strong currents and surge. Marine life recorded here includes scorpionfish, sea stars, and red gorgonians, alongside uncommon sightings of garibaldi, horn sharks, Spanish shawls, and California spiny lobsters. Water temperatures remain between 14 and 17 degrees Celsius, necessitating a 7mm wetsuit or drysuit. Always monitor for boat traffic and use a surface marker buoy.

Pelican Rookery at Anacapa Island is a shallow reef and kelp forest site suitable for beginner divers. The site maintains an average depth of 5 metres. Access is exclusively by boat, and divers should be prepared for mild currents and surge. Visibility at this location typically ranges between 5 and 15 metres. Water temperatures fluctuate throughout the year, ranging from 14C in the winter and spring months to 20C during late summer and autumn. Hazards at this site include cold water, potential entanglement in kelp, surge, and the presence of sharks. Typical dives at this location last approximately 45 minutes.

Goldfish Bowl is a reef and kelp forest site located off Anacapa Island in the Channel Islands National Park. Accessible only by boat, the site features depths ranging from 20 to 65 metres, with an average depth of 40 metres. Divers should be prepared for mild currents and visibility typically between 20 and 40 metres. Water temperatures are cool, fluctuating between 13C and 16C throughout the year. Due to the depth and potential for strong currents and surf, this site is suited for intermediate divers. Typical dive times at this location are approximately 50 minutes.

Net Reef at Anacapa Island offers a diverse underwater environment featuring a combination of reef, wall, and kelp forest topography. This site is suitable for beginners and supports drift diving due to moderate currents. Depths range from 4 to 30 metres, with an average of 15 metres. Visibility typically spans 10 to 30 metres. Access is by boat only, and divers should be prepared for cold water temperatures between 14 and 17 degrees Celsius. Hazards include surge, strong currents, and boat traffic at the surface. A 7mm wetsuit or drysuit is recommended to manage the thermal conditions.

Rat Rock is a marine site located at Anacapa Island within the Channel Islands National Park. The topography features a combination of reef, wall, and kelp forest structures. Divers typically experience depths ranging from 5 to 9 metres, with an average depth of 7 metres. Access to this site requires a boat, as it is situated 1609 metres from the shore. Conditions at the site include moderate currents and visibility between 12 and 15 metres. Divers should be aware of potential hazards including sharp coral, strong currents, and surge. Typical dives at this location last approximately 45 minutes.

Frenchy's Cove is a shallow, rocky reef located on the north side of the west islet of Anacapa Island. This site is primarily accessed by boat and offers snorkeling opportunities in depths ranging from 1 to 10 metres. Conditions are generally calm, though visitors should be aware of potential hazards including surf, strong currents, and entanglement. Visibility typically fluctuates between 10 and 25 metres. Due to the water temperatures, which range from 14C to 21C, a 7mm wetsuit or drysuit is recommended for comfort. Access to this area is seasonal to protect nesting birds, and the site is well-suited for beginners.