Izu Peninsula reef is a shore-entry site featuring a significant drop-off that extends from 10 to 40 metres, with an average depth of 25 metres. Divers should be prepared for moderate currents and plan their profiles accordingly. Visibility typically ranges between 10 and 30 metres. Due to the depth and current, this site is suited for intermediate divers. Surface conditions require vigilance, as boat traffic is a known hazard during entry and exit. Divers are advised to deploy a surface marker buoy and time their dives around slack water when possible. Water temperatures fluctuate seasonally between 16 and 24 degrees Celsius.

Koganezaki is a shore-entry site located beneath the Horse Rock on the Izu Peninsula. The topography features a mix of reef, artificial reef, and muck environments, characterised by rare white sand. Depths range from 5 to 18 metres, with an average of 8 metres, making it suitable for beginners. Conditions are generally calm with mild currents, though visibility can fluctuate between 8 and 25 metres. Surf may present a hazard at this location. Facilities available on-site include parking, toilets, showers, changing rooms, and a dive shop. Typical dives last approximately 50 minutes.

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.

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.

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.

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.

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.

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.