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Nagasu Kō Lighthouse

Iso Green 6s🇯🇵Nagasu, JPOperational

Location & Light Range

About Nagasu Kō Lighthouse

Constructed in 1981, the Nagasu Kō lighthouse is an 8.5-meter cylindrical concrete post. It is attached to a single-story concrete equipment room and painted white. This structure is situated at the end of the main, northern breakwater of Nagasu. The lighthouse emits an isophase green light on a 6-second cycle. Its focal height reaches 13 meters, providing a geographic range of 11.3 nautical miles. The lighthouse is located 1.2 kilometers from the nearest port of Nagasu, Kumamoto.

Why it matters: The Nagasu Kō lighthouse clearly marks the end of the main breakwater, guiding vessels safely into and out of the port. Its consistent green light helps prevent collisions with harbor infrastructure, ensuring smooth operations for commercial and fishing traffic.

Light & Optic

Characteristic Signature
Iso Green 6s
Flash Type
Isophase
Light Color
Green
Interval
6s
Raw Code
Iso G 6s
Focal Height
13m
Geographic Range
11.3NM

Construction & History

Year Built
1981

References & Identifiers

Nearest Port
Nagasu, Kumamoto(1.2 km)
ARLHS No.
JPN-2103

Tower & Structure

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

Structure: A white 8.5m cylindrical concrete post, attached to a square 1-story concrete equipment room.

Location

City
Nagasu
Country
🇯🇵Japan
Region
Kumamoto Prefecture
Sea Region
Located at the end of the main (north) breakwater of Nagasu.
Latitude
32.9230°
Longitude
130.4387°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Nagasu Kō Lighthouse at night?+
Nagasu Kō displays the characteristic Iso Green 6s. 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 Nagasu Kō Lighthouse guide vessels into?+
Nagasu Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Nagasu, Kumamoto at 0.2 NM to the ENE. Other ports served include Miike, Fukuoka (5.3 NM NNW), Eishi (6.9 NM SE), Taira (7.4 NM WSW), Shimabara (7.9 NM SSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Nagasu Kō Lighthouse still active and maintained?+
Yes, Nagasu 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 Nagasu Kō Lighthouse?+
Nagasu 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 Nagasu Kō Lighthouse?+
You can track vessels near Nagasu 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.