Dougashima features a diverse underwater landscape comprising caves, walls, reefs, and drop-offs. Located on the Izu Peninsula, this site offers depths ranging from 5 to 21 metres with an average of 10 metres, making it suitable for beginners. Access is by boat only, and divers encounter mild currents and visibility between 10 and 20 metres. The site includes overhead environments within the cave sections, requiring careful buoyancy control. Water temperatures fluctuate between 16C and 26C throughout the year. Divers should remain aware of boat traffic and exercise caution around sharp coral and sea urchins present on the rocky surfaces.

Marine Station Dogashima features a combination of reef and cave topography suitable for beginner divers. Located on the Izu Peninsula, this site is accessed exclusively by boat. While conditions are generally mild, the area is prone to strong currents, requiring careful monitoring of local conditions before entry. Divers should remain close to their guide, particularly when exploring the cave system. Water temperatures fluctuate seasonally between 16C and 28C. Species recorded around this area include wrasses, boxfish, various crabs, shrimp, and snails. Facilities at the station include parking, air fills, equipment rental, and guided tours to assist with logistics.

Located off the Izu Peninsula, this reef and drop-off site offers depths ranging from 10 to 40 metres, with an average depth of 25 metres. The site is accessed by boat and is suited for intermediate divers due to the significant depth and moderate currents. Visibility typically spans 10 to 30 metres, allowing for clear views of the wall structure. Water temperatures fluctuate between 16 and 24 degrees Celsius throughout the year. Divers should remain aware of potential shark activity and the risk of strong currents, particularly near the drop-off edge. Proper buoyancy control and surface marker buoys are essential for this exposed location.

Futou on the Izu Peninsula features a diverse underwater landscape comprising a natural reef, a cave, and an artificial reef structure. Suitable for beginners, the site ranges in depth from 6 to 30 metres. Divers experience mild currents, though visibility can fluctuate, requiring careful buoyancy control when navigating the cave and swim-through sections. Shore entry requires caution due to surf and sharp rocks; timing your entry between sets is recommended. Water temperatures vary between 16 and 24 degrees Celsius throughout the year. Species recorded around this area include wrasses, boxfish, hermit crabs, crabs, shrimp, snails, and striped shore crabs.

Futou Beach on the Izu Peninsula is a pebbly shore entry site featuring a rugged underwater landscape of reefs, caves, and arches. Divers can explore these geological formations at depths ranging from 5 to 13 metres, with an average depth of 8 metres. Conditions are generally suitable for intermediate divers, with visibility typically spanning 10 to 30 metres and mild currents. The site is also well-regarded for snorkelling. Facilities at the beach include parking, toilets, showers, changing rooms, and a cafe. Be aware that surf conditions can occur at this location. Typical dives last approximately 50 minutes, with water temperatures fluctuating between 16C and 26C throughout the year.

Tago features a diverse underwater topography comprising reef, pinnacle, and artificial reef structures. The site ranges in depth from 3 to 40 metres, with an average depth of 14 metres, making it suitable for beginners. Divers can access the site via shore or boat. Visibility varies significantly from 5 to 30 metres, and water temperatures fluctuate between 16 and 24 degrees Celsius throughout the year. Moderate to strong currents are common, requiring careful monitoring of local conditions. Facilities available on-site include parking, toilets, showers, changing rooms, air fills, and gear storage. Night diving is permitted at this location, which remains open year-round.

Mikomotojima is a boat-access reef and drift dive site located off the Izu Peninsula. The site features depths ranging from 5 to 30 metres, with an average depth of 15 metres. Conditions are defined by strong currents influenced by the Kuroshio Current, requiring advanced certification and careful buoyancy control. Visibility typically holds between 10 and 14 metres. Divers should remain close to the boat and monitor depth gauges closely due to the potential for rapid pressure changes. A reef hook and surface marker buoy are recommended for all dives. Water temperatures fluctuate between 16 and 25 degrees Celsius throughout the year.

Arari is a boat-accessible dive site on the Izu Peninsula featuring a combination of reef and wall topography. The site ranges from 5 to 22 metres in depth, with an average depth of 15 metres. Divers encounter moderate currents and visibility typically between 10 and 25 metres. Due to potential surge, swell, and boat traffic, this site is suited for intermediate divers. Night diving is available, offering a different perspective of the underwater terrain. Facilities including air fills, equipment rental, and showers are available nearby. Divers should remain alert for boat traffic during ascents and monitor conditions closely as surge and visibility can fluctuate.