Sado lies in the Sea of Japan off Niigata, where warm and cold currents meet and feed a wide spread of dive sites around the island. Boats run out of small harbours such as Kita-Koura to sites only minutes away. Aka-Iwa is the signature dive, with resident kobudai, the giant Asian sheepshead wrasse, swimming up to meet divers, while Kotoura is known for its underwater topography. Summer and autumn bring water far clearer than the snow-country image of Niigata suggests.
About diving in Sado Island
Diving on Sado is a short-hop boat affair: most sites lie 3 to 15 minutes from the harbour. Kita-Koura, where the boats work Aka-Iwa, Nagate and an artificial reef, is one of the standard areas. Another is Kotoura, where a dive clubhouse sits on an inlet a minute's walk from the boat that runs to the sites. Dive spots are spread right around the island, and guides pick the day's sites to suit the state of the sea.
The meeting of warm and cold currents gives the island good visibility and a rich mix of life. Aka-Iwa holds nudibranchs for macro photographers, schools of pelagic fish and giant Pacific octopuses, and one of its kobudai goes by the name Kojiro. Elsewhere on the Kita-Koura boat sites, divers have logged a kinubari pair in breeding colours, schooling isaki, juvenile cleaner wrasse and a charging hiramasa.
Sado suits divers who want temperate-water diving without long transits, and photographers who want both nudibranchs and big wrasse at one site. On land, the Sado Gold Mine, developed during the Edo period, and the Japanese Crested Ibis Conservation Center give non-diving companions a reason to make the ferry crossing.
Best time to dive Sado Island
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Fair | Fair | Fair | Fair | Good | Good | Good | Prime | Prime | Good | Good | Fair |
As winter sets in, monsoon winds off Siberia cool the sea quickly, and by early spring the water falls to 10°C or below; February and March run 10 to 11°C. The sea warms back through early summer, and from summer into autumn the clarity turns almost tropical. After Obon the water is at its warmest and clearest of the year: August reaches 24 to 26°C and September 25 to 26.5°C.
Dive types & marine life
Kobudai, giant Asian sheepshead wrasse, are residents at Aka-Iwa and often swim right up to divers on entry. Their territorial battles and spawning come in early summer.
- Reef
- Nudibranchs
- Octopus & cuttlefish
- Reef fish swarms
Best dive sites in Sado Island
- 1
Aka-Iwa
Boat site just off Kita-Koura fishing port at 14–26 m (46–85 ft), home to resident kobudai.
- 2
Nagate
Boat site where nijiginpo guard their eggs and a small lionfish turns up in season.
- 3
Washizaki
Site where summer brings light blue water and schools of chagara gobies and damselfish.
Site guides
Reef
Resident kobudai wrasse, one of them known as Kojiro, that swim up to divers on entry
How to get to Sado Island
Divers reach the island on the Niigata to Ryotsu ferry: the jetfoil crosses in about an hour and the regular ferry in around 2.5 hours. Dive boats leave from island harbours such as Kita-Koura.
Dive videos
佐渡島 ダイビング コブダイ Scuba Diving Sado Island, Japan · KATSU MIYA on YouTube
【佐渡島】コブダイ＆沈船ダイビング Diving in Sado island, Niigata · _diving&snorkeling TK on YouTube
Questions divers ask
Are the boat rides to Sado dive sites long?+
No. Most dive points sit 3 to 15 minutes from the harbour by boat, short enough that divers prone to seasickness usually manage comfortably.
Can beginners or divers without a certification dive on Sado?+
Yes. Aka-Iwa takes beginners as well as advanced divers, and visitors without a certification can snorkel or join an introductory diving course.
When is the water clearest around Sado?+
From late summer into autumn: August visibility runs 12.5 to 20 m, against 5 to 10 m in March.
Sources
- Sado Island & Hokuriku: Diving the Wild Beauty of the Sea of Japan — PADI
- A variety of marine activities | Sado Sightseeing Navi — Sado Tourism Association
- Trial, Fun and PADI Diving on Sado Island — Freeway
- Freeway blog — Freeway
- Sado diving by month — Freeway
- F.WAVE diving service — F.WAVE
- Ryōtsu Average Sea Temperatures — SeaTemperature.org
- Sado - Wikivoyage — Wikivoyage
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