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Senzaki Kō Outer No. 1 Breakwater Lighthouse

F Green 4s🇯🇵Nagato, JPOperational

Location & Light Range

About Senzaki Kō Outer No. 1 Breakwater Lighthouse

This concrete lighthouse stands 9.5 meters tall and features a white, square, single-story equipment shelter. A green light flashes once every four seconds from a focal height of 11 meters. It is situated at the north end of a detached breakwater in Senzaki harbor. The lighthouse has a geographic range of 10.7 nautical miles. While the site is open, the tower itself is closed to the public. It is located about 0.7 kilometers from the nearest port.

Why it matters: This lighthouse warns mariners of the north end of the detached breakwater, aiding navigation into and out of Senzaki harbor from the east.

Light & Optic

Characteristic Signature
F Green 4s
Flash Type
Fixed
Light Color
Green
Interval
4s
Raw Code
F.Fl G 4s
Focal Height
11m
Geographic Range
10.7NM

Location

City
Nagato
Country
🇯🇵Japan
Region
Yamaguchi Prefecture
Sea Region
Senzaki harbor, marking the north end of the northern detached breakwater.
Latitude
34.3957°
Longitude
131.2042°

References & Identifiers

Nearest Port
Senzaki(0.7 km)
Admiralty No.
M7381.8
ARLHS No.
JPN-1653

Tower & Structure

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

Structure: A 9.5m concrete post attached to a square 1-story concrete equipment shelter, painted white.

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 Senzaki Kō Outer No. 1 Breakwater Lighthouse at night?+
Senzaki Kō Outer No. 1 Breakwater displays the characteristic F Green 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 green color may indicate a specific sector or warning zone.
Which ports and harbors does Senzaki Kō Outer No. 1 Breakwater Lighthouse guide vessels into?+
Senzaki Kō Outer No. 1 Breakwater Lighthouse assists vessels approaching 5 nearby ports. The closest is Senzaki at 0.7 NM to the SSE. Other ports served include Fukawa (1.3 NM WSW), Hagi (10.6 NM ENE), Awano (11.8 NM WSW), Kottoi (16.1 NM WSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Senzaki Kō Outer No. 1 Breakwater Lighthouse still active and maintained?+
Yes, Senzaki Kō Outer No. 1 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.
What shipping routes pass near Senzaki Kō Outer No. 1 Breakwater Lighthouse?+
Senzaki Kō Outer No. 1 Breakwater 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 Senzaki Kō Outer No. 1 Breakwater Lighthouse?+
You can track vessels near Senzaki Kō Outer No. 1 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.