Chiba south · KominatoNo.1295★★Open in map →

Tainoura

— Wild sea bream that rise to a boat off Kominato

natureOff the trail — and worth it

A stretch of sea at Kominato in Kamogawa where wild red sea bream gather in shallow water, protected as a Special Natural Monument of Japan. A sightseeing boat takes visitors out to watch them rise for feed beside the hull.

FromTokyo Stn
~2-2.5 hrJR express, then walk
Get off atAwa-Kominato Stn (JR Sotobo Line)
On foot
Tainoura

Directions ↗

The sweet spot

This is a well-known sightseeing cruise, not a hidden spot. What makes it special is the encounter itself: the bream are wild, and the operator warns that they may not appear in some water-temperature and wave conditions.

Where it is

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What to look for — in walking order

Tainoura boat pierSuikotei / CC BY-SA 4.0

Tainoura boat pierthe operator's building at the water's edge, whose exhibition hall is included in the boat fare
Uchiura Bay viewsthe cruise's loop of the bay off Kominato, seen from the boat
The bream groundthe stop where the crew tap the hull and wild red sea bream rise to the surface
Tanjoji templea head temple of the Nichiren school, first founded at his birthplace and moved after earthquakes and tsunamis
Tanjosui springthe spring said to have welled up at Nichiren's birth, marked by a stone pillar in the temple grounds

How to actually get there

Tokyo Stn → Awa-Kominato Stn (Limited Express Wakashio, just under 2 hr; check that the train runs through to Awa-Kominato).
Awa-Kominato Stn → Tainoura boat pier (walk ~20 min, or taxi).
Buy a ticket at the pier and board; no reservation is needed.
After the cruise, walk to Tanjoji temple and the Tanjosui spring.

Wakashio express to Awa-Kominato: Tokyo Stn →(Limited Express Wakashio via the Sotobo Line, just under 2 hr)→ Awa-Kominato Stn →(walk ~20 min)→ the boat pier. Some Wakashio services turn back at Katsuura or earlier, so check that your train runs through to Awa-Kominato. JR East listed the Sotobo Line as running normally on 1 Oct 2026.
Return from Awa-Kominato: Walk back to Awa-Kominato Stn and take the Wakashio or a Sotobo Line local toward Chiba and Tokyo. Express services are not frequent, so note the return times when you arrive.

Directions from my location (Google Maps) ↗

About the place

Tainoura is the tourist name for a stretch of sea off Kominato, on the Pacific coast of southern Boso; as a place name it is Myo-no-ura. Red sea bream usually live in deeper water, yet here a resident population gathers near the surface. Locals link the fish to the monk Nichiren, and catching them is banned. The national designation protects the bream's habitat itself. From a pier close to Tanjoji temple, a sightseeing boat loops around the bay and stops at the bream ground. When the crew tap the hull and scatter feed, the fish surge up around the boat. Why they stay in such shallow water has still not been fully explained.

How to enjoy it

Boats run without reservations, even for one passenger. Operating hours are 8:30–15:50 from April to September, 8:30–15:20 in March and October, and 8:30–14:50 from November to February. Sailings are cancelled in rough weather, and the operator posts each day's status on its website, so check before you set out. After the cruise, walk over to Tanjoji to round out the Nichiren story.

Background & history

Nichiren, the Kamakura-period monk who founded the Nichiren school of Buddhism, was born in Kominato. Tradition says three wonders marked his birth, one of them a great shoal of sea bream at the surface. Local fishermen came to revere the fish as his incarnation and stopped catching them. Tsunamis, including the one from the Genroku earthquake of 1703, reshaped this coast, and a Nichiren priest later named its coves after the characters of the Lotus Sutra's title, Myo-no-ura among them. The habitat became a Natural Monument in 1922 and a Special Natural Monument in 1967.

Before you go

Cash: The boat fare, which includes the exhibition hall, is listed by the operator at 1,500 yen for adults (junior-high age and up) and 900 yen for elementary-school children, after a revision on 1 June 2026; nursery and kindergarten children ride free. The official site does not state payment methods, so carry cash.
Good to know: Boats operate all year but are cancelled in rough weather. The bream are wild and may not appear in some water and wave conditions. The pier has no parking of its own; drivers use nearby paid lots.
Another way: Aqua-Line highway buses on the Tokyo–Katsuura route run from Bus Terminal Tokyo Yaesu toward Kominato; check the operators' timetables. From Awa-Kominato Stn, a taxi to the pier is also convenient.
After you get off: From Awa-Kominato Stn, walk about 20 minutes to the pier, which stands on the waterfront close to the main gate of Tanjoji temple.