East Asia · Japan
Nanki-Shirahama & Tanabe
A wreck covered in schooling fish, five minutes from the harbour
Shirahama, in Wakayama on the south-west of the Kii Peninsula, dives the boat points of Kanayama Bay, five to ten minutes from port, and calm beaches on Tanabe Bay. The Kuroshio keeps the water mild enough for tropical fish to overwinter among temperate species. The Sensen wreck, smothered in sweepers and cardinalfish, is the signature dive, backed by arches at Irozu and Payman Cape, goby sand at Sengokuoka and a deep drop-off at Ebise. Short boat rides and sheltered beaches keep it diveable in any month.
About diving in Nanki-Shirahama & Tanabe
Shirahama has about 15 dive points. The main boat points sit in Kanayama Bay, the nearest five minutes from the harbour and most within ten, so seasickness rarely becomes a problem, and because the points sit so close in, small waves seldom close them. Beach entries add calm shallow dives: one starts straight from the sand in front of a dive centre, and the beach facing Engetsu Island, beside the aquarium, is the fallback in typhoons and winter storms.
The seabed is rock and white sand, cut into ridges, arches and channels. West of the wreck, Kita no ne is a large ridge running north to south with arches along it, and the shop-front beach opens through a channel onto white sand between bowl-shaped rocks. The Kuroshio mixes tropical and temperate life: clownfish, neon damselfish and stripeys sit on the rocks off that beach while silver-stripe round herring school above them.
New divers have the widest choice: the three beaches, Irozu and Kita no ne are all rated for beginners, and Sandan and Double Arch are intermediate dives. Ebise is rated advanced, and Kasumi no ne, 15 minutes out by boat, drops to 38 m. Some Shirahama shops also dive the points at Kushimoto, the southernmost town in Wakayama, for divers who want a more tropical scene, since water and life grow more tropical further south.
Best time to dive Nanki-Shirahama & Tanabe
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Good | Good | Good | Good | Good | Good | Prime | Prime | Good | Good | Good | Good |
Boats and beaches work through the whole year. February brings the coldest water, about 17 °C on average, and days below 15 °C are rare, so tropical fish stay through the winter. The northwest wind can blow hard in winter, but the beach in front of Engetsu Island stays calm even in strong cold snaps. The water warms through spring to its peak of about 28 °C in August. Summer is the high season; the south wind is often strong then, but Kanayama Bay and Tanabe Bay open away from it, so most days are calm.
Dive types & marine life
Dense schools of sweepers and cardinalfish cover the Sensen wreck. Frogfish and nudibranchs are frequent finds, and tropical fish survive the winter here, so colourful species stay even when fish numbers drop. Kasumi no ne holds fields of a sea anemone that, in Japan, is seen only around Shirahama and Tanabe.
- Wreck
- Reef
- Wall
- Reef fish swarms
- Frogfish
- Nudibranchs
- Macro critters
Best dive sites in Nanki-Shirahama & Tanabe
- 1
Sensen
Wreck about 28 m long at 10–18 m, its hull covered in schooling sweepers and cardinalfish.
- 2
Irozu
Three arches and a sand channel with walls near 10 m high, at 10–16 m.
- 3
Payman Cape
One of the largest arches on the peninsula, 6 m high and 15 m long, at 18–28 m.
- 4
Sengokuoka
Gobies sharing burrows with shrimp on the sand at 20 m.
- 5
Sandan
Rare nudibranchs, harlequin shrimp and other crustaceans near the 30 m bottom.
- 6
Double Arch
Two arches on a long ridge at 21–28 m, deep enough to hold up in wind and swell.
- 7
Ebise
Drop-off falling straight from 17 to 40 m, rated for advanced divers.
- 8
Gongenzaki Beach
White sand and thickets of branching coral at 3–7 m, just north of Shirarahama beach.
Site guides
Wall
A drop-off that falls in one plunge from 17 m to 40 m
Reef
A sand channel walled by rock nearly 10 m high on both sides
Reef
An arch 15 m long, among the largest on the Kii Peninsula
Reef
Harlequin shrimp and boxer crabs on the bottom near 30 m
Sand slope
Shrimpgobies paired with snapping shrimp on the sand at 20 m
Wreck
Sweepers and cardinalfish packed so thick they hide the hull
How to get to Nanki-Shirahama & Tanabe
Nanki-Shirahama Airport has daily flights to Tokyo Haneda, with buses to JR Shirahama Station. Kuroshio limited express trains run hourly from Shin-Osaka (2 hr 30 min) and Tennoji (2 hr 15 min). The dive centres are in Shirahama town, close to the boat points and beaches.
Photos from Nanki-Shirahama & Tanabe
663highland · CC BY 2.5
Questions divers ask
Is Shirahama diving suitable for beginners?+
Yes. The three beaches, Irozu and Kita no ne are rated for beginners, and the boat points are 5 to 10 minutes from port, which helps anyone prone to seasickness; Ebise is rated advanced.
Can divers dive Shirahama in winter?+
Yes. Tropical fish overwinter, February water rarely drops below 15 °C, and when the northwest wind blows the beach facing Engetsu Island stays calm.
What is the Sensen wreck at Shirahama?+
A wreck about 28 m long lying at 10–18 m, five minutes by boat, covered in schools of sweepers and cardinalfish. It is the best-known dive in Shirahama.
What closes the dive sites at Shirahama?+
Small waves rarely close the boat points, which sit close to port; in typhoons and winter storms the beach facing Engetsu Island is the fallback.
Sources
- ダイビングポイント紹介 | ミスオーシャン — Miss Ocean Diving Service
- 和歌山の海について — Dive Supply
- Dive Supply — Dive Supply
- Water temperature in Shirahama — SeaTemperature.info
- Shirahama – Wikivoyage — Wikivoyage
Photo credits
- Engetsu Island, a pale sandstone islet with a sea arch through its middle and pine-topped crests, in deep blue water under a light blue sky by 663highland, CC BY 2.5, via Wikimedia Commons
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