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Uno Kō Lighthouse

Fl White 3s🇯🇵Naoshima, JPOperational

Location & Light Range

About Uno Kō Lighthouse

Uno Kō lighthouse was established and first lit in 1911. It stands on a rectangular concrete pier in Uno harbor, near Tamano and off the northeast coast of Naoshima. The structure is a 9-meter tall, white cylindrical concrete tower. Its light is white and flashes once every 3 seconds, with a geographic range of 10.7 nautical miles. The lighthouse is situated on a shoal within the harbor, assisting vessels navigating the area.

Why it matters: This lighthouse is a rare surviving example of an early Japanese harbor light, providing insight into historical maritime infrastructure development.

Light & Optic

Characteristic Signature
Fl White 3s
Flash Type
Flashing
Light Color
White
Interval
3s
Raw Code
Fl W 3s
Focal Height
11m
Geographic Range
10.7NM

Construction & History

Year Built
1911

References & Identifiers

Nearest Port
Uno(0.9 km)
ARLHS No.
JPN-2481

Tower & Structure

Tower Height
9m
Tower Shape
cylindrical
Tower Color
white and mounted on a rectangular concrete pier
Material
concrete

Structure: round strongly conical tower, painted white and mounted on a rectangular concrete pier

Location

City
Naoshima
Country
🇯🇵Japan
Region
Kagawa Prefecture
Sea Region
a shoal in Uno harbor in Tamano, off the northeast coast of Naoshima
Latitude
34.4739°
Longitude
133.9478°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Uno Kō Lighthouse at night?+
Uno Kō displays the characteristic Fl White 3s. 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 Uno Kō Lighthouse guide vessels into?+
Uno Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Tamano at 0.4 NM to the WSW. Other ports served include Futamado (0.6 NM N), Futamata, Kagoshima (0.6 NM N), Futamata, Shimane (0.6 NM N), Matama (0.6 NM N). Mariners should consult the relevant chart for full approach and pilotage information.
Is Uno Kō Lighthouse still active and maintained?+
Yes, Uno 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 Uno Kō Lighthouse?+
Uno 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 Uno Kō Lighthouse?+
You can track vessels near Uno 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.