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Onahama Kō Lighthouse

Fl (2) Red 7s🇯🇵Iwaki, JPOperational

Location & Light Range

About Onahama Kō Lighthouse

This red, cylindrical concrete tower stands 13 meters tall with a focal height of 19 meters. It is located at the end of Onahama's new outer breakwater in Iwaki City, Fukushima Prefecture. The lighthouse emits a single red flash every 7 seconds, visible for 12.9 nautical miles. The lantern has been removed from the structure. Although the site is accessible, the tower itself is closed to the public, and it is only reachable by boat.

Why it matters: This lighthouse marks the end of the new outer breakwater, guiding vessels safely into Onahama harbor and preventing collisions with the structure.

Light & Optic

Characteristic Signature
Fl (2) Red 7s
Flash Type
Flashing
Light Color
Red
Flash Count
2 flashes
Interval
7s
Raw Code
Fl R 7s
Focal Height
19m
Geographic Range
12.9NM

Location

City
Iwaki
Country
🇯🇵Japan
Region
Fukushima Prefecture
Sea Region
Located at the end of the new outer breakwater of Onahama.
Latitude
36.9390°
Longitude
140.9106°

References & Identifiers

Nearest Port
Onahama(1.4 km)
Admiralty No.
M6499.8
NGA No.
4632
ARLHS No.
JPN-1361

Tower & Structure

Tower Height
13m
Tower Shape
cylindrical
Tower Color
red
Material
concrete

Structure: round concrete tower; lantern removed

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 Onahama Kō Lighthouse at night?+
Onahama Kō displays the characteristic Fl (2) Red 7s — 2 red flashes every 7 seconds. 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 red color may indicate a specific sector or warning zone.
Which ports and harbors does Onahama Kō Lighthouse guide vessels into?+
Onahama Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Ishiwaki at 0.6 NM to the WSW. Other ports served include Onahama (1.3 NM WSW), Nakanosaku (2.3 NM ENE), Ena (3 NM NE), Hirakata (7.5 NM SW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Onahama Kō Lighthouse still active and maintained?+
Yes, Onahama 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 Onahama Kō Lighthouse?+
Onahama 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 Onahama Kō Lighthouse?+
You can track vessels near Onahama 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.