Top 5 Clearest Dive Sites Within 2 Hours of Tokyo — Real Data Rankings
2026-03-11
Clearest diving within 2 hours of Tokyo. #1 Ito (Chiba) 15.9m, #2 Akinohama 14.3m.
Weekend Diving Near Tokyo: Ranking Clarity Within 2 Hours
For Tokyo-based divers who want maximum visibility without flying to Okinawa, here are the top 5 clearest dive sites accessible within roughly 2–2.5 hours, ranked by real observation data from our 46,000-entry database.
Note: Hachijojima (avg 17.2m) is excluded here as travel time is longer by regular ferry. See our Izu Islands comparison article for more.
Top 5 Rankings
| Rank | Site | Annual Avg. | Access from Tokyo |
|---|---|---|---|
| #1 | Ito (Tateyama, Chiba) | 15.9m | ~1.5–2h drive from Tokyo. ~2h by highway bus via Tateyama-do. |
| #2 | Akinohama (Izu Oshima) | 14.3m | ~1h45m by high-speed jet ferry from Takeshiba Pier. ~25 min by prop plane from Haneda. |
| #3 | IOP (Izu Oceanic Park) | 13.8m | ~2.5h by Izu Kyuko train + bus. ~2–2.5h drive via Tomei Expressway + Izu Jukan. |
| #4 | Koganezaki (West Izu) | 13.4m | ~2–2.5h drive from Tokyo. ~3h by train + bus (Shuzenji + bus). |
| #5 | Futone (West Izu) | 12.3m | ~2–2.5h drive from Tokyo (near Osezaki). |
#1 Ito (Tateyama, Chiba) — 15.9m average
Access: ~1.5–2h drive from Tokyo. ~2h by highway bus via Tateyama-do.
Best season: Jan 18.8m / Dec 18.7m (winter best)
Wetsuit: 5mm or drysuit (Jan–Mar water temp 15–16°C)
Kanto's clearest site. Popular for large sharks (bamboo/leopard). Relatively stable year-round. Recorded 40m maximum.
#2 Akinohama (Izu Oshima) — 14.3m average
Access: ~1h45m by high-speed jet ferry from Takeshiba Pier. ~25 min by prop plane from Haneda.
Best season: Jan/Dec 15.1m (annual swing only 1.5m)
Wetsuit: 5mm (summer) to drysuit (winter)
Japan's most stable visibility site. Stays 13–15m from January to December. Great for beginners.
#3 IOP (Izu Oceanic Park) — 13.8m average
Access: ~2.5h by Izu Kyuko train + bus. ~2–2.5h drive via Tomei Expressway + Izu Jukan.
Best season: Jan 18.6m (AI accuracy 82% — Japan's best)
Wetsuit: 3mm (summer) to drysuit (winter)
Most-observed site in our database (3,151). Japan's best AI prediction accuracy. High clarity in winter (18m), but spring turbidity drops to ~10m in Apr–May.
#4 Koganezaki (West Izu) — 13.4m average
Access: ~2–2.5h drive from Tokyo. ~3h by train + bus (Shuzenji + bus).
Best season: Dec/Jan 14–15m range
Wetsuit: 3mm (summer) to drysuit (winter)
High-clarity spot in West Izu. Popular for colorful nudibranchs and fish watching. 2–3m clearer than neighboring Osezaki.
#5 Futone (West Izu) — 12.3m average
Access: ~2–2.5h drive from Tokyo (near Osezaki).
Best season: Jan ~14m / Dec ~13m
Wetsuit: 3mm (summer) to drysuit (winter)
Higher clarity among Osezaki-area sites. 4–5m clearer than Osezaki Bay (7.6m). Popular as an open-sea option on the same day as Osezaki.
Monthly Comparison (Top 3 Sites)
| Month | Ito | Akinohama | IOP |
|---|---|---|---|
| Jan | 18.8m | 15.1m | 18.6m |
| Feb | 17.4m | 14.9m | 17.7m |
| Mar | 16.4m | 14.1m | 13.7m |
| Apr | 14.8m | 13.6m | 10.1m |
| May | 15.9m | 13.4m | 10.6m |
| Jun | 15.7m | 14.1m | 11.3m |
| Jul | 13.2m | 13.8m | 11.6m |
| Aug | 15m | 13.8m | 12.3m |
| Sep | 14.7m | 14.9m | 12.7m |
| Oct | 15.8m | 14.9m | 13.7m |
| Nov | 15m | 14.5m | 14.7m |
| Dec | 18.7m | 15.1m | 17.3m |
Best Site by Season
- Dec–Feb (winter): Ito & IOP lead at 18m+. But expect 15–16°C water — drysuit recommended.
- Mar–May (spring): IOP crashes to ~10m due to spring bloom. Choose Akinohama (stable 13–14m) or Ito (15–16m).
- Jun–Aug (summer): All sites 12–15m. Ito maintains the lead.
- Sep–Nov (autumn): Ito and Akinohama stay stable; IOP recovers toward 14m.
Summary
The clearest diving within 2 hours of Tokyo is Ito (Chiba) at 15.9m annual average, hitting 18m+ in December–January. For consistent year-round clarity, Akinohama (Izu Oshima) at 14.3m is unbeatable — just 1.75 hours by fast ferry. Both work perfectly for weekend trips.
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