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Ako Kō Outer Breakwater Lighthouse

Fl White 3s🇯🇵Tokyo, JPOperational

Location & Light Range

About Ako Kō Outer Breakwater Lighthouse

This concrete lighthouse, built in 1987, stands on the main breakwater at the entrance to Ako harbor, Japan. The cylindrical tower measures 10 meters tall and is painted white. It features a flared top and emits a white flash every three seconds. The focal height of the light is 16 meters, providing a geographic range of 12.2 nautical miles. The site is accessible to the public, though the tower itself remains closed.

Why it matters: The lighthouse marks the end of the main breakwater, a hazard to navigation, and is essential for vessels entering and exiting Ako harbor.

Light & Optic

Characteristic Signature
Fl White 3s
Flash Type
Flashing
Light Color
White
Interval
3s
Raw Code
Fl W 3s
Focal Height
16m
Geographic Range
12.2NM

Construction & History

Year Built
1987

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
10m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round concrete tower with a flared top

Location

City
Tokyo
Country
🇯🇵Japan
Region
Miyake Subprefecture
Sea Region
Ako harbor, Japan, marking the end of the main breakwater.
Latitude
34.0685°
Longitude
139.4796°

References & Identifiers

Nearest Port
Mikurajima(11.6 km)
Admiralty No.
M6276.3
NGA No.
4938
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Frequently Asked Questions

How do mariners identify Ako Kō Outer Breakwater Lighthouse at night?+
Ako Kō Outer Breakwater displays the characteristic Fl White 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 white color may indicate a specific sector or warning zone.
Which ports and harbors does Ako Kō Outer Breakwater Lighthouse guide vessels into?+
Ako Kō Outer Breakwater Lighthouse assists vessels approaching 5 nearby ports. The closest is Toshima/Tokyo at 28.9 NM to the NNW. Other ports served include Nishitokyo (40 NM N), Okada (43.6 NM N), Shimoda, Shizuoka (44.4 NM NW), Inatori (47.5 NM NNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ako Kō Outer Breakwater Lighthouse still active and maintained?+
Yes, Ako 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 Ako Kō Outer Breakwater Lighthouse?+
Ako 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 Ako Kō Outer Breakwater Lighthouse?+
You can track vessels near Ako 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.