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Inu Shima Shiraishi Lighthouse

Fl (3) White 10s🇯🇵Okayama, JPOperational

Location & Light Range

About Inu Shima Shiraishi Lighthouse

Also known as: Inu Shima Shiraishi (Inujima Siroisi)

Constructed in 1964, the Inu Shima Shiraishi Lighthouse stands 10 meters high. The structure is a round, cylindrical concrete tower, 10 meters above sea level, painted black with one yellow horizontal stripe, and is set on a concrete pier. It displays a white flashing light every 10 seconds, which can be seen for 10.4 nautical miles. Located on a reef 3.4 kilometers from Ushimado, it is situated about 6 kilometers southeast of the Okayama harbor entrance, on the east side of Inu Shima island. Access to the grounds is permitted, though the tower is not open for entry.

Why it matters: This lighthouse serves as a navigation aid, marking a reef near the eastern shore of Inu Shima and assisting vessels navigating toward the Okayama port.

Light & Optic

Characteristic Signature
Fl (3) White 10s
Flash Type
Flashing
Light Color
White
Flash Count
3 flashes
Interval
10s
Raw Code
Fl W 10s
Focal Height
10m
Geographic Range
10.4NM

Construction & History

Year Built
1964

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
10m
Tower Shape
cylindrical
Tower Color
black with one yellow horizontal band
Material
concrete

Structure: round cylindrical concrete tower mounted on a concrete pier

Location

City
Okayama
Country
🇯🇵Japan
Region
Okayama Prefecture
Sea Region
Located on a reef off the east coast of Inu Shima, a small, inhabited island about 6 km southeast of the entrance to Okayama harbor.
Latitude
34.5633°
Longitude
134.1128°

References & Identifiers

Nearest Port
Ushimado(3.4 km)
Admiralty No.
M5751.4
NGA No.
8036
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Frequently Asked Questions

How do mariners identify Inu Shima Shiraishi Lighthouse at night?+
Inu Shima Shiraishi displays the characteristic Fl (3) White 10s — 3 white flashes every 10 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 white color may indicate a specific sector or warning zone.
Which ports and harbors does Inu Shima Shiraishi Lighthouse guide vessels into?+
Inu Shima Shiraishi Lighthouse assists vessels approaching 5 nearby ports. The closest is Ushimado at 3.6 NM to the NE. Other ports served include Ieura (4.9 NM SSW), Yamada (5 NM W), Tonosho (5.8 NM SE), Ikeda, Kagawa (7.8 NM SE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Inu Shima Shiraishi Lighthouse still active and maintained?+
Yes, Inu Shima Shiraishi 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 Inu Shima Shiraishi Lighthouse?+
Inu Shima Shiraishi 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 Inu Shima Shiraishi Lighthouse?+
You can track vessels near Inu Shima Shiraishi 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.