About this spot
Obi-iwa, known locally as アントニオガウデイ, is a notable dive site built around a striking rock formation off Japan's coast. The site draws divers year-round, making it accessible regardless of season. The reef structure supports healthy coral with no signs of bleaching stress, offering a stable ecosystem for marine life observation. Three documented species observations confirm the site hosts diverse marine life typical of Japanese temperate waters. The rock formation itself creates natural channels and crevices that shelter small fish, nudibranchs, and crustaceans. Visibility and depth vary with conditions, so checking recent dive logs before your trip is wise. Obi-iwa sits outside any marine protected area, which means access is straightforward. The site has generated community video content, giving you a preview of what to expect underwater. Local dive operators familiar with the site can brief you on seasonal conditions and current patterns before descent.
📖 Guide: Diving in Japan: 42 Sites from Sharks to Stone Monuments
Dive types
Trip essentials
Everything you need before you pack — checklist, sun, logistics.
Trip checklist
- 🛂 Visa-free or visa-on-arrival
- 📜 C-card + dive insurance (DAN)
- 📔 Dive logbook
- 🧴 Reef-safe sunscreen SPF 50+
- 🔌 Plug type A/B · 100V adapter
- 💊 Seasickness meds + ear drops
- 📱 Offline maps + emergency contact
Quick facts
- 🌓 Moon First quarter · 48%
- GPS
› Sustainability disclosures
FAQ
›When is the best time to dive Obi-iwa?
Obi-iwa is diveable year-round. Each season brings different water conditions and marine activity. Check current reports from local operators before booking to match your experience level and comfort with seasonal variables.
›What marine life will I see?
The site supports documented species typical of Japanese temperate reefs, including small fish, nudibranchs, and crustaceans. The rock formation and healthy coral provide habitat for diverse marine life. Community videos give you a preview of common sightings.
›Are there access or permit requirements?
Obi-iwa is not inside a marine protected area, so standard access applies. Contact local dive operators for current entry procedures, parking, and any local guidelines before your visit.
›What is the difficulty level and depth?
Specific depth and difficulty ratings depend on where you enter the site and current conditions. Consult recent dive logs and local operators to match the dive to your certification and experience.
