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Nagai Kō Lighthouse

Oc Red 4s🇯🇵Yokosuka, JPOperational

Location & Light Range

About Nagai Kō Lighthouse

This red concrete lighthouse, built in 1980, stands 8 meters tall on the southern breakwater of Nagai Kō. Its focal height reaches 9.5 meters, casting an occulting red light that flashes every 4 seconds. The structure consists of a concrete post mounted on a 1-story square equipment room, with the entire lighthouse painted red. It guides vessels into the port located on the west side of the Miura Peninsula. The site is open to the public, though the tower itself is closed.

Why it matters: This light is important for local fishing boats and smaller commercial vessels navigating the entrance to Nagai port, ensuring their safe passage around the main breakwater.

Light & Optic

Characteristic Signature
Oc Red 4s
Flash Type
Occulting
Light Color
Red
Interval
4s
Raw Code
Oc R 4s
Focal Height
9.5m
Geographic Range
10.2NM

Construction & History

Year Built
1980

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
8m
Tower Color
red
Material
concrete

Structure: An 8m concrete post attached to a 1-story square concrete equipment room, with the entire lighthouse painted red.

Location

City
Yokosuka
Country
🇯🇵Japan
Region
Kanagawa Prefecture
Sea Region
end of the south (main) breakwater of Nagai, on the west side of the Miura peninsula
Latitude
35.2084°
Longitude
139.6097°

References & Identifiers

Nearest Port
Misaki, Kanagawa(4.2 km)
Admiralty No.
M6339
NGA No.
5392
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Frequently Asked Questions

How do mariners identify Nagai Kō Lighthouse at night?+
Nagai Kō displays the characteristic Oc Red 4s. 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 Nagai Kō Lighthouse guide vessels into?+
Nagai Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Zushi at 4.7 NM to the NNW. Other ports served include Maguchi (5.1 NM SE), Hayama (5.3 NM NNE), Hamakanaya (5.5 NM ENE), Kurihama (5.5 NM E). Mariners should consult the relevant chart for full approach and pilotage information.
Is Nagai Kō Lighthouse still active and maintained?+
Yes, Nagai 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 Nagai Kō Lighthouse?+
Nagai 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 Nagai Kō Lighthouse?+
You can track vessels near Nagai 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.