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Overview
Hira-shima is an island belonging to Tateyama City, Chiba Prefecture. Floating in the sea of Tateyama near the southern tip of the Bōsō Peninsula, the island evokes the flat form suggested by its name, and its greatest attraction is the sweeping view of sea and sky all around. There are no large tourist facilities here, and that is precisely why it suits travelers seeking a quiet seascape, offering untouched coastal nature and the peaceful maritime mood of the Tateyama Bay area.
Highlights
- ●A small, flat-formed island in the sea of Tateyama
- ●Untouched coast and the peaceful mood of Tateyama Bay
- ●The island's silhouette set against the sea on clear days
- ●A quality suited to journeys seeking a quiet seascape
History
Hira-shima is a small island belonging to Tateyama City, surrounded by the mild waters of the southern Bōsō Peninsula. These seas have long gone hand in hand with fishing, and islands and reefs are thought to have played a part in local life as fishing landmarks and as habitats for sea creatures. For the island's detailed history, whether landing is permitted, and the rules for the surrounding area, it is best to check official sources or local guidance.
Access
The island lies in the waters of Tateyama City (around 35.02°N, 139.84°E). Tateyama is served by the JR Uchibō Line, and from Tateyama Station it is common to head toward the coast by bus, taxi, or car. Whether landing on the island itself is possible, the means of crossing, and any marine activities nearby—including safety matters—should always be confirmed through official information or local guidance.
Best season
Early summer through summer, when the sea sparkles brightest, is the season to feel the appeal of Tateyama's waters most fully. From autumn into winter the clear air brings a beautiful contrast between the island's silhouette and the sea, and on many days the distant scenery is visible far off. Coastal weather and wave conditions change easily, so check the day's information before you visit.
Map
35.0247, 139.8383 · Wikidata
Suggested itinerary
- 1Arrive at Tateyama Station on the JR Uchibō Line
- 2Head toward the coast and gaze over the sea of Tateyama
- 3Enjoy a seaside stroll while viewing Hira-shima
- 4Close the trip with Tateyama's seafood and evening scenery
Did you know?
💡 Tateyama Bay is known for its calm waters—so tranquil it is also called Kagami-ga-ura, the Mirror Bay—and small islands and reefs like Hira-shima add a fitting accent to that scenery. At dusk, the sea and sky glow madder-red and the island's silhouette rises against them for a memorable sight.
Nearby spots
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