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Koemachi Kō Lighthouse

Fl G 4s🇯🇵Nagasaki Area, JPOperational

Location & Light Range

About Koemachi Kō Lighthouse

A square, 14-meter concrete post supports the green light at Koemachi Kō. The structure includes a 1-story concrete equipment shelter at its base. A green, white, and black square daymark is visible on the tower. The light emits a single green flash every 4 seconds. It is situated at the end of a short breakwater marking the entrance to Koemachi, a small boat harbor on Nagasaki's west side. Access to the pier is restricted.

Light & Optic

Characteristic Signature
Fl G 4s
Flash Type
Flashing
Light Color
Green
Flash Count
1 flash
Interval
4s
Raw Code
Fl
Focal Height
14m
Geographic Range
7NM

Construction & History

Year Built
1979

References & Identifiers

Admiralty No.
M5198.8
NGA No.
11812
ARLHS No.
JPN-2207
OpenStreetMap
View on OSM →

Tower & Structure

Tower Height
14m
Tower Shape
square
Tower Color
green
Material
concrete

Structure: Mast, green, white, and black square daymark

Location

City
Nagasaki Area
Country
🇯🇵JP
Latitude
32.7537°
Longitude
129.8074°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Koemachi Kō Lighthouse at night?+
Koemachi Kō displays the characteristic Fl G 4s — 1 green flash every 4 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 green color may indicate a specific sector or warning zone.
Which ports and harbors does Koemachi Kō Lighthouse guide vessels into?+
Koemachi Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Nagasaki at 2.4 NM to the SE. Other ports served include Aikawa, Nagasaki (3.1 NM SE), Furue, Nagasaki (3.1 NM SE), Furusato, Nagasaki (3.1 NM SE), Fukue, Nagasaki (3.1 NM SE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Koemachi Kō Lighthouse still active and maintained?+
Yes, Koemachi 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 Koemachi Kō Lighthouse?+
Koemachi 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 Koemachi Kō Lighthouse?+
You can track vessels near Koemachi 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.