Harley Reef in Apra Harbor, Guam, is a unique dive site featuring both reef topography and a historical wreck. The site is notable for a 1944/45 WLA Flathead Harley-Davidson motorcycle resting at a depth of approximately 3 metres. Beyond the wreck, the site consists of a sloping wall covered in coral. Divers can expect depths ranging from 3 to 37 metres, with an average depth of 15 metres. Conditions are generally mild, though visibility fluctuates between 2 and 27 metres. Access to this site requires a boat. Due to the presence of sharp coral, divers should exercise caution when navigating the area.

The Kitsugawa Maru is a freighter sunk in July 1944 that sits upright in Apra Harbor. The wreck remains approximately 80 percent intact, featuring a large bow gun and masts that begin at 18 metres. Divers can expect depths ranging from 15 to 42 metres, with an average of 27 metres. This boat-only dive is suited for advanced divers due to the depth and overhead environment. Visibility varies between 4 and 20 metres, and moderate currents are common. Marine life frequently recorded at the site includes pufferfish and wrasses, alongside less common species such as Pacific doublesaddle butterflyfish, threadfin butterflyfish, flagtail triggerfish, and blackback anemonefish.

Val Bomber is a Japanese aircraft wreck located in Apra Harbor, resting against the side of a reef. The wreck lies at a depth of 26 metres, with the site ranging from 9 to 30 metres. In addition to the aircraft, divers can explore numerous barges situated in the shallower sections of the site. Access is by boat only, and the site is suited for advanced divers due to the depth. Conditions typically feature mild currents and visibility ranging from 9 to 15 metres. Water temperatures remain consistent throughout the year, between 28 and 30 degrees Celsius.

The Tokai Maru is a WWII Japanese freighter resting on its port side in Apra Harbor. Sunk on 27 August 1943, the wreck lies at depths between 15 and 40 metres, with an average depth of 25 metres. It is notable for resting against the SMS Cormoran, allowing divers to touch both a WWI and WWII wreck simultaneously. Access is by boat only, located 1500 metres from shore. Divers encounter common species including pufferfish, wrasses, cardinalfish, soldierfish, and hermit crabs, alongside less frequent sightings of butterflyfish, triggerfish, and various sea stars. Due to the depth and overhead environment, this site is strictly for advanced divers.

OutHouse Beach in Apra Harbor is a versatile shore entry site featuring both natural reef and artificial reef structures. Suitable for beginners, the site offers depths ranging from 3 to 18 metres with an average of 10 metres. Divers and snorkellers should be aware of moderate currents, boat traffic, and potential hazards including sharp coral and stonefish. Visibility typically fluctuates between 7 and 12 metres. The site is accessible for night diving, with typical dives lasting around 45 minutes. Facilities at the location include toilets. Water temperatures remain warm throughout the year, ranging from 28 to 30 degrees Celsius.

Barge Reef in Apra Harbor, Guam, features a WWII Amtrak wreck resting in a sand channel at a depth of 12 metres. The site is an artificial reef structure surrounded by a natural reef. Divers can access the site by boat or from the shore, located approximately 500 metres out. Conditions vary, with visibility ranging from 5 to 25 metres and moderate currents present. Due to the potential for strong currents, this site is suited for intermediate divers. Typical dives last around 45 minutes, with water temperatures remaining warm between 28C and 30C throughout the year.

SMS Cormoran is a German merchant raider scuttled in 1917, resting in Apra Harbor at depths between 12 and 40 metres. The wreck lies alongside the Tokai Maru, with both vessels accessible to divers at a depth of approximately 29 metres. This site is reserved for advanced divers due to the overhead environment, potential for nitrogen narcosis, and deep water. Visibility ranges from 6 to 37 metres, and moderate currents are common. Access is strictly by boat, and divers must remain vigilant regarding boat traffic in the harbour. Water temperatures remain consistent throughout the year, typically between 28 and 30 degrees Celsius.

Blue and White is a varied dive site in Apra Harbor, Guam, featuring a combination of reef, wall, and artificial reef structures. Located 1000 metres from shore, the site requires boat access. Divers encounter a drop-off that begins at approximately 12 metres, descending to an average depth of 33 metres, with a maximum of 39 metres. Conditions include moderate currents and visibility ranging from 12 to 30 metres. Marine life recorded here includes wrasses, pufferfish, emperor angelfish, regal angelfish, and various butterflyfish and anemonefish. Due to the depth and current, this site is suited for intermediate divers. Hazards include sharp coral, strong currents, and surf.