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Oki Kō Breakwater Lighthouse

Fl Green 3s🇯🇵Tokyo, JPOperational

Location & Light Range

About Oki Kō Breakwater Lighthouse

This cylindrical concrete tower, standing 9.5 meters tall with a focal height of 11 meters, is painted white and marks the western breakwater at Oki Kō, the port of Haha Jima. Its location is near the southern tip of the island. The lighthouse emits a green flash every 3 seconds, visible for 10.7 nautical miles. The site is open to the public, though the tower itself is closed. It serves as a navigational aid at the harbor entrance.

Why it matters: This lighthouse is indispensable for the safe navigation of ships entering and departing Oki Kō, the primary port for Haha Jima, guiding vessels through the breakwater entrance.

Light & Optic

Characteristic Signature
Fl Green 3s
Flash Type
Flashing
Light Color
Green
Interval
3s
Raw Code
Fl G 3s
Focal Height
11m
Geographic Range
10.7NM

Location

City
Tokyo
Country
🇯🇵Japan
Sea Region
Located at the end of the west breakwater at Oki Kō, the port of Haha Jima, near the southern tip of the island.
Latitude
26.6348°
Longitude
142.1588°

References & Identifiers

Nearest Port
Ogasawara(27.7 km)
Admiralty No.
M8351
NGA No.
4974
ARLHS No.
OGA-002

Tower & Structure

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

Structure: round cylindrical white concrete tower

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 Oki Kō Breakwater Lighthouse at night?+
Oki Kō Breakwater 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.
Is Oki Kō Breakwater Lighthouse still active and maintained?+
Yes, Oki Kō 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.
How can I track vessels near Oki Kō Breakwater Lighthouse?+
You can track vessels near Oki Kō 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.