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Shiraisishima Kō Lighthouse

F Red 5s🇯🇵Kasaoka, JPOperational

Location & Light Range

About Shiraisishima Kō Lighthouse

Shiraisishima Kō is a red, 8.5-meter concrete lighthouse located at the end of the main breakwater for Shiraisi Shima. It features a square, one-story concrete equipment room at its base and stands 12 meters above sea level. The lighthouse emits a single red flash every 5 seconds, visible for 11 nautical miles. The site is open to the public, but the tower itself is closed. The lighthouse is situated near Kasaoka in Japan's Okayama Prefecture.

Why it matters: This lighthouse clearly marks the end of the main breakwater, preventing collisions with the harbor entrance structure and ensuring safe passage for vessels entering and exiting the port.

Light & Optic

Characteristic Signature
F Red 5s
Flash Type
Fixed
Light Color
Red
Interval
5s
Raw Code
F.Fl R 5s
Focal Height
12m
Geographic Range
11NM

Location

City
Kasaoka
Country
🇯🇵Japan
Region
Okayama Prefecture
Sea Region
Located at the end of the main breakwater of Shiraisi Shima.
Latitude
34.4115°
Longitude
133.5182°

References & Identifiers

Nearest Port
Fukuyama, Hiroshima(3.8 km)
Admiralty No.
M5732.02
NGA No.
8296
ARLHS No.
JPN-1900

Tower & Structure

Tower Height
8.5m
Tower Shape
square
Tower Color
red
Material
concrete

Structure: A 8.5m concrete post rising from a square 1-story concrete equipment room, painted red.

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 Shiraisishima Kō Lighthouse at night?+
Shiraisishima Kō displays the characteristic F Red 5s. 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 red color may indicate a specific sector or warning zone.
Which ports and harbors does Shiraisishima Kō Lighthouse guide vessels into?+
Shiraisishima Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Fukuyama, Kagoshima at 4.4 NM to the WNW. Other ports served include Kuyama (4.4 NM WNW), Fukuyama, Hiroshima (5 NM WNW), Kasaoka (5.2 NM N), Asakuchi (7.1 NM NNE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Shiraisishima Kō Lighthouse still active and maintained?+
Yes, Shiraisishima Kō 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 Shiraisishima Kō Lighthouse?+
Shiraisishima Kō 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 Shiraisishima Kō Lighthouse?+
You can track vessels near Shiraisishima Kō 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.