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Kōzu Shima Lighthouse

Fl White/Red 12s🇯🇵Tokyo, JPOperational

Location & Light Range

About Kōzu Shima Lighthouse

Also known as: Kōzu Shima (Ichinokubi Saki)

Constructed of concrete in 1951, the Kōzu Shima Lighthouse is a 15-meter cylindrical tower. It rises from a single-story keeper's house and features a lantern and gallery. The lighthouse stands at the southwestern tip of Kōzu Shima, an island within Tokyo's Oshima Subprefecture. Its focal height reaches 121 meters, providing a geographic range of 27 nautical miles. The light emits a directional signal with white and red flashes, cycling every 12 seconds.

Why it matters: This lighthouse is important for guiding vessels around the southwestern tip of Kōzu Shima, a critical navigation point. Its directional light provides precise information to ships approaching from various directions.

Light & Optic

Characteristic Signature
Fl White/Red 12s
Flash Type
Flashing
Light Color
White/Red
Interval
12s
Raw Code
Fl W/R 12s (directional)
Focal Height
121m
Geographic Range
27NM

Construction & History

Year Built
1951

References & Identifiers

Nearest Port
Shikinejima(9.9 km)
Admiralty No.
M6274
NGA No.
5564
ARLHS No.
JPN-280

Tower & Structure

Tower Height
15m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round cylindrical concrete tower with lantern and gallery, rising from a 1-story concrete keeper's house

Location

City
Tokyo
Country
🇯🇵Japan
Region
Oshima Subprefecture
Sea Region
Located at the southwestern tip of Kōzu Shima.
Latitude
34.1904°
Longitude
139.1234°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Kōzu Shima Lighthouse at night?+
Kōzu Shima displays the characteristic Fl White/Red 12s. 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/red color may indicate a specific sector or warning zone.
Which ports and harbors does Kōzu Shima Lighthouse guide vessels into?+
Kōzu Shima Lighthouse assists vessels approaching 5 nearby ports. The closest is Toshima/Tokyo at 20.8 NM to the NNE. Other ports served include Shimoda, Shizuoka (29.9 NM NNW), Inatori (35.2 NM N), Matsuzaki (38.3 NM NNW), Okada (38.3 NM NNE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Kōzu Shima Lighthouse still active and maintained?+
Yes, Kōzu Shima 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 Kōzu Shima Lighthouse?+
Kōzu Shima 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 Kōzu Shima Lighthouse?+
You can track vessels near Kōzu Shima 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.