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Yatsushiro Kō Groin Lighthouse

Fl Green 3s🇯🇵Yatsushiro, JPOperational

Location & Light Range

About Yatsushiro Kō Groin Lighthouse

This concrete lighthouse stands 9.5 meters tall, with its light positioned 13 meters above the water. The cylindrical tower is painted white and rests on a square platform supported by piles. It is located at the end of a partially-submerged training wall in Yatsushiro harbor. The structure emits a single green flash every 3 seconds, visible for 11.3 nautical miles. The site is accessible to the public, but the tower itself is closed.

Why it matters: This light marks the end of a submerged training wall, a potential hazard to vessels navigating Yatsushiro harbor.

Light & Optic

Characteristic Signature
Fl Green 3s
Flash Type
Flashing
Light Color
Green
Interval
3s
Raw Code
Fl G 3s
Focal Height
13m
Geographic Range
11.3NM

Location

City
Yatsushiro
Country
🇯🇵Japan
Region
Kumamoto Prefecture
Sea Region
Yatsushiro harbor, at the end of a partially-submerged training wall.
Latitude
32.5469°
Longitude
130.5511°

References & Identifiers

Nearest Port
Yatsushiro(1.6 km)
ARLHS No.
JPN-2115

Tower & Structure

Tower Height
9.5m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round concrete tower mounted on a square platform supported by piles

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 Yatsushiro Kō Groin Lighthouse at night?+
Yatsushiro Kō Groin 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 Yatsushiro Kō Groin Lighthouse guide vessels into?+
Yatsushiro Kō Groin Lighthouse assists vessels approaching 5 nearby ports. The closest is Yatsushiro at 1.9 NM to the S. Other ports served include Kagami (4.2 NM NE), Amura (5.2 NM WSW), Aizu, Kumamoto (5.3 NM NW), Akasaki, Kumamoto (5.3 NM NW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Yatsushiro Kō Groin Lighthouse still active and maintained?+
Yes, Yatsushiro Kō Groin 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 Yatsushiro Kō Groin Lighthouse?+
Yatsushiro Kō Groin 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 Yatsushiro Kō Groin Lighthouse?+
You can track vessels near Yatsushiro Kō Groin 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.