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Okikamuro Shima Naga Se Lighthouse

Fl (4) Green 13s🇯🇵Suo-Oshima, JPOperational

Location & Light Range

About Okikamuro Shima Naga Se Lighthouse

Okikamuro Shima Naga Se lighthouse is a green, cylindrical concrete tower, standing 11 meters tall on a concrete pier. It is situated off the southern tip of Okikamuro Shima, a small island near the south coast of Yashiro Shima. The structure emits four green flashes every 13 seconds, visible for nearly 12 nautical miles. The lighthouse is built on a submerged reef, serving as a warning to vessels in the area. While the site is accessible by boat, the tower itself is closed to visitors. The nearest port, Yoshiura, is approximately 6 kilometers away.

Why it matters: This lighthouse is important for vessels navigating the waters between Okikamuro Shima and Yashiro Shima, specifically warning them away from the reef it marks.

Light & Optic

Characteristic Signature
Fl (4) Green 13s
Flash Type
Flashing
Light Color
Green
Flash Count
4 flashes
Interval
13s
Raw Code
Fl(4) G 13s
Focal Height
15m
Geographic Range
11.9NM

Location

City
Suo-Oshima
Country
🇯🇵Japan
Region
Yamaguchi Prefecture
Sea Region
A reef just off the southern tip of Okikamuro Shima, a small island off the south coast of Yashiro Shima.
Latitude
33.8459°
Longitude
132.3647°

References & Identifiers

Nearest Port
Yoshiura(5.9 km)
Admiralty No.
M5641
NGA No.
9202
ARLHS No.
JPN-1603

Tower & Structure

Tower Height
11m
Tower Shape
cylindrical
Tower Color
green
Material
concrete

Structure: round concrete tower, mounted on a round concrete pier

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Okikamuro Shima Naga Se Lighthouse at night?+
Okikamuro Shima Naga Se displays the characteristic Fl (4) Green 13s — 4 green flashes every 13 seconds. 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 green color may indicate a specific sector or warning zone.
Which ports and harbors does Okikamuro Shima Naga Se Lighthouse guide vessels into?+
Okikamuro Shima Naga Se Lighthouse assists vessels approaching 5 nearby ports. The closest is Ihota at 7.1 NM to the NNE. Other ports served include Kuka (8.3 NM NW), Hirao (13.1 NM WNW), Yanai (13.3 NM WNW), Tsuzu Yamaguchi (14.7 NM NNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Okikamuro Shima Naga Se Lighthouse still active and maintained?+
Yes, Okikamuro Shima Naga Se 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 Okikamuro Shima Naga Se Lighthouse?+
Okikamuro Shima Naga Se 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 Okikamuro Shima Naga Se Lighthouse?+
You can track vessels near Okikamuro Shima Naga Se 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.