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Ōkuno Shima Lighthouse

Iso White 6s🇯🇵Takamatsu, JPOperational

Location & Light Range

About Ōkuno Shima Lighthouse

Also known as: Ōkuno Shima (relocated)

Built in 1894, this cylindrical stone lighthouse originally stood on Ōkuno Shima in the Inland Sea of Hiroshima Prefecture. The white tower, standing 3.5 meters tall, was later relocated to Shikoku Mura, an architectural museum near Takamatsu. The lighthouse, now an exhibit, features a lantern and is painted white. Its focal height is 21 meters, and it once had a geographic range of 13.4 nautical miles. The light characteristic was an isophase white light on a 6-second cycle.

Why it matters: The lighthouse is significant as a preserved artifact of Japan's maritime history, relocated to Shikoku Mura to ensure its survival and educate visitors about early lighthouses in the Inland Sea.

Light & Optic

Characteristic Signature
Iso White 6s
Flash Type
Isophase
Light Color
White
Interval
6s
Raw Code
Iso W 6s
Focal Height
21m
Geographic Range
13.4NM

Construction & History

Year Built
1894

Significant events: Became inactive, relocated to Shikoku Mura museum

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
3.5m
Tower Shape
cylindrical
Tower Color
white
Material
stone

Structure: round stone tower with lantern, painted white

Location

City
Takamatsu
Country
🇯🇵Japan
Region
Kagawa Prefecture
Sea Region
Originally on Ōkuno Shima island in the Inland Sea, Hiroshima Prefecture. Now located at Shikoku Mura, an architectural museum on the southern slope of Mount Yashima, about 5 km east of Takamatsu harbor.
Latitude
34.3461°
Longitude
134.1103°

References & Identifiers

Nearest Port
Takamatsu(2.9 km)
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Frequently Asked Questions

How do mariners identify Ōkuno Shima Lighthouse at night?+
Ōkuno Shima displays the characteristic Iso White 6s. Each lighthouse has a unique flash pattern published in the List of Lights, allowing mariners to positively identify it and distinguish it from other navigation aids in the area. The white color may indicate a specific sector or warning zone.
Which ports and harbors does Ōkuno Shima Lighthouse guide vessels into?+
Ōkuno Shima Lighthouse assists vessels approaching 5 nearby ports. The closest is Takamatsu at 3.6 NM to the WNW. Other ports served include Tsuda (7.6 NM ESE), Tonosho (8.9 NM NNE), Ieura (9.1 NM NNW), Naoshima (9.3 NM NW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ōkuno Shima Lighthouse still active and maintained?+
Yes, Ōkuno Shima Lighthouse is currently operational. It is actively maintained and continues to emit its characteristic light signal for marine navigation. Most modern lighthouses are automated and monitored remotely by the national maritime authority.
What shipping routes pass near Ōkuno Shima Lighthouse?+
Ōkuno Shima Lighthouse is located within the Japan / Korea shipping lane — a busy shipping corridor linking the major ports of Japan and South Korea. This makes it an important navigation reference for commercial shipping traffic in the region.
How can I track vessels near Ōkuno Shima Lighthouse?+
You can track vessels near Ōkuno Shima Lighthouse in real time using MarineRadar. The platform shows live AIS positions of ships in the area, including vessel name, type, flag, speed, and course. Use the "Track Vessels Nearby" button on this page to open the live map centered on this lighthouse.