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Iki O Se Lighthouse

Fl (2) White 6s🇯🇵Iki, JPOperational

Location & Light Range

About Iki O Se Lighthouse

Also known as: Iki O Se (U Se)

The Iki O Se lighthouse is a cylindrical concrete tower, 8.5 meters tall, painted white with a focal height of 14 meters. Its distinctive hourglass shape distinguishes it among navigational aids. This active light emits a single white flash every 6 seconds, providing a geographic range of 11.6 nautical miles. Located just off the mainland of Iki Shima, it stands opposite the Funori Se light. The site is open to visitors, though access to the tower itself is restricted. The nearest port, Yobuko, is 17.6 kilometers away.

Why it matters: This lighthouse marks a specific coastal hazard or passage off the mainland of Iki Shima, ensuring safe transit for local fishing boats and other vessels. Its unique hourglass-shaped concrete tower is an architecturally distinct structure among Japanese lighthouses.

Light & Optic

Characteristic Signature
Fl (2) White 6s
Flash Type
Flashing
Light Color
White
Flash Count
2 flashes
Interval
6s
Raw Code
Fl W 6s
Focal Height
14m
Geographic Range
11.6NM

Location

City
Iki
Country
🇯🇵Japan
Region
Nagasaki Prefecture
Sea Region
Located just off the mainland of Iki Shima, opposite the Funori Se light.
Latitude
33.7533°
Longitude
129.6447°

References & Identifiers

Nearest Port
Yobuko(17.6 km)
Admiralty No.
M5259.34
NGA No.
12632
USCG No.
JCG-5937

Tower & Structure

Tower Height
8.5m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round hourglass-shaped concrete tower

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 Iki O Se Lighthouse at night?+
Iki O Se displays the characteristic Fl (2) White 6s — 2 white flashes every 6 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 Iki O Se Lighthouse guide vessels into?+
Iki O Se Lighthouse assists vessels approaching 5 nearby ports. The closest is Ashibe at 6.5 NM to the ENE. Other ports served include Katsumoto (6.7 NM NNE), Yobuko (17.7 NM SE), Tobo (21.7 NM SE), Karatsu (22.8 NM SE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Iki O Se Lighthouse still active and maintained?+
Yes, Iki O 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 Iki O Se Lighthouse?+
Iki O 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 Iki O Se Lighthouse?+
You can track vessels near Iki O 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.