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Otohama Kō Lighthouse

Fl Red 3s🇯🇵Tateyama, JPOperational

Location & Light Range

About Otohama Kō Lighthouse

A 10-meter red concrete cylindrical post is situated at the end of a detached breakwater, indicating the entry to Otohama harbor near Tateyama. This post is affixed to a square, one-story concrete equipment building. The light produces a red flash every 3 seconds, with a geographic range of 12.4 nautical miles. Access to the site is permitted, though the tower itself remains inaccessible to visitors. The structure is located at 139.824548,34.914955.

Why it matters: This navigation aid helps maritime traffic safely enter Otohama harbor, marking the breakwater opening for fishing vessels and commercial ships.

Light & Optic

Characteristic Signature
Fl Red 3s
Flash Type
Flashing
Light Color
Red
Interval
3s
Raw Code
Fl R 3s
Focal Height
17m
Geographic Range
12.4NM

Location

City
Tateyama
Country
🇯🇵Japan
Region
Chiba Prefecture
Sea Region
Otohama harbor, at the end of a detached breakwater
Latitude
34.9150°
Longitude
139.8245°

References & Identifiers

Nearest Port
Tateyama(4.6 km)

Tower & Structure

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

Structure: A 10m red concrete post attached to a square 1-story concrete equipment shelter.

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 Otohama Kō Lighthouse at night?+
Otohama Kō displays the characteristic Fl Red 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 red color may indicate a specific sector or warning zone.
Which ports and harbors does Otohama Kō Lighthouse guide vessels into?+
Otohama Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Muya at 5.2 NM to the NNW. Other ports served include Tateyama (5.6 NM NNE), Wada (11.8 NM NE), Maguchi (15.5 NM NNW), Abuto (16.7 NM NE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Otohama Kō Lighthouse still active and maintained?+
Yes, Otohama 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 Otohama Kō Lighthouse?+
Otohama 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 Otohama Kō Lighthouse?+
You can track vessels near Otohama 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.