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Katsumoto Kō Outer Breakwater Lighthouse

Fl Green 3s🇯🇵Iki, JPOperational

Location & Light Range

About Katsumoto Kō Outer Breakwater Lighthouse

A white, cylindrical concrete tower, 11 meters in height, with its light 15 meters above sea level. The structure is round with a flared top, connected to a small equipment shelter. It displays a green light, flashing every 3 seconds (Fl G 3s), with a geographic range of 11.9 nautical miles. Located on the southern end of an outer detached breakwater, it marks the western entry to Katsumoto, a fishing harbor on Iki Island. Access to the grounds is permitted, but the tower is not open for entry.

Why it matters: This light serves as a navigation aid for ships entering and leaving Katsumoto port, a significant reference for the local fishing fleet in the nearby waters.

Light & Optic

Characteristic Signature
Fl Green 3s
Flash Type
Flashing
Light Color
Green
Interval
3s
Raw Code
Fl G 3s
Focal Height
15m
Geographic Range
11.9NM

Location

City
Iki
Country
🇯🇵Japan
Region
Nagasaki Prefecture
Sea Region
Located at the south end of a detached outer breakwater at the western entrance to Katsumoto, the fishing port at the northern tip of Iki Shima.
Latitude
33.8586°
Longitude
129.6790°

References & Identifiers

Nearest Port
Yobuko(21.7 km)
Admiralty No.
M5259.45
NGA No.
12638
ARLHS No.
JPN-2202

Tower & Structure

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

Structure: round concrete tower with a flared top, attached to a small equipment shelter

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 Katsumoto Kō Outer Breakwater Lighthouse at night?+
Katsumoto Kō Outer Breakwater displays the characteristic Fl Green 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 green color may indicate a specific sector or warning zone.
Which ports and harbors does Katsumoto Kō Outer Breakwater Lighthouse guide vessels into?+
Katsumoto Kō Outer Breakwater Lighthouse assists vessels approaching 5 nearby ports. The closest is Katsumoto at 0.6 NM to the E. Other ports served include Ashibe (4.9 NM SE), Yobuko (21.8 NM SSE), Tobo (25.9 NM SSE), Karatsu (26.7 NM SSE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Katsumoto Kō Outer Breakwater Lighthouse still active and maintained?+
Yes, Katsumoto Kō Outer Breakwater 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 Katsumoto Kō Outer Breakwater Lighthouse?+
Katsumoto Kō Outer Breakwater 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 Katsumoto Kō Outer Breakwater Lighthouse?+
You can track vessels near Katsumoto Kō Outer Breakwater 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.