Get the MarineRadar appSatellite AISSatellite live trackingTrack any shipLive alerts112,000+ ships trackedDownload free

Ashiya Kō Lighthouse

Fl Green 3s🇯🇵Ashiya, JPOperational

Location & Light Range

About Ashiya Kō Lighthouse

Also known as: Ashiya Kō (Outer Breakwater)

This 9.5-meter white concrete post structure marks the western end of Ashiya harbor's detached breakwater, situated at the Onga River's mouth. It features a square, single-story concrete equipment room and stands 13 meters above sea level. The post emits a green flash every three seconds. Its site is open to the public, though the tower itself remains closed. The light has a geographic range of 11.3 nautical miles.

Why it matters: This light warns mariners of the western extent of the detached breakwater, facilitating safe entry into Ashiya harbor and transit at the Onga River mouth.

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
Ashiya
Country
🇯🇵Japan
Region
Fukuoka Prefecture
Sea Region
Located at the west end of the detached breakwater of Ashiya harbor, at the mouth of the Onga River.
Latitude
33.8977°
Longitude
130.6491°

References & Identifiers

Nearest Port
Yawata(7.9 km)
Admiralty No.
M5291.55
NGA No.
12430
USCG No.
JCG-5805.1

Tower & Structure

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

Structure: A 9.5m white concrete post attached to a square 1-story concrete equipment room.

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.
Live tracking · 50,000+ mariners

Find Ashiya Kō Lighthouse on the live nautical map

Plan voyages near Japan, see nearby vessels in real time, and explore 14,900+ navigation aids in the app.

Nautical mapNearby vesselsVoyage planning
Get the App

Frequently Asked Questions

How do mariners identify Ashiya Kō Lighthouse at night?+
Ashiya Kō 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 Ashiya Kō Lighthouse guide vessels into?+
Ashiya Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Ashiya, Fukuoka at 0.4 NM to the E. Other ports served include Hibikishinko (7.2 NM NE), Yawata/Kitakyushu (7.8 NM E), Wakamatsu/Kitakyushu (8.1 NM E), Tobata/Kitakyushu (8.5 NM E). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ashiya Kō Lighthouse still active and maintained?+
Yes, Ashiya 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 Ashiya Kō Lighthouse?+
Ashiya 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 Ashiya Kō Lighthouse?+
You can track vessels near Ashiya 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.