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Takamatsu Detached Breakwater Southwest Head Lighthouse

Iso Green 6s🇯🇵Takamatsu, JPOperational

Location & Light Range

About Takamatsu Detached Breakwater Southwest Head Lighthouse

This operational lighthouse is situated at the southwest end of Takamatsu's detached breakwater. The structure is an 11-meter tall, cylindrical concrete tower with a flared top and an attached equipment shelter. Its focal height is 13 meters, and it emits an isophase green light on a 6-second cycle, visible for 11.3 nautical miles. The lighthouse is located in Kagawa Prefecture, about 0.3 kilometers from the nearest port, Takamatsu. Access is restricted to boat only, and the site and tower are closed to the public.

Why it matters: This lighthouse warns mariners of the end of the detached breakwater, preventing collisions and safeguarding passage into Takamatsu Port, a busy area within the Seto Inland Sea.

Light & Optic

Characteristic Signature
Iso Green 6s
Flash Type
Isophase
Light Color
Green
Interval
6s
Raw Code
Iso G 6s
Focal Height
13m
Geographic Range
11.3NM

Location

City
Takamatsu
Country
🇯🇵Japan
Region
Kagawa Prefecture
Sea Region
Southwest end of the detached breakwater of Takamatsu, halfway between the Tamano and Asahimachi breakwater lights.
Latitude
34.3611°
Longitude
134.0552°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
11m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round concrete tower with a flared top, attached to a small equipment shelter

References & Identifiers

Nearest Port
Takamatsu(0.3 km)
Admiralty No.
M5540.9
NGA No.
8168
ARLHS No.
JPN-2475
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Frequently Asked Questions

How do mariners identify Takamatsu Detached Breakwater Southwest Head Lighthouse at night?+
Takamatsu Detached Breakwater Southwest Head displays the characteristic Iso Green 6s. 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 Takamatsu Detached Breakwater Southwest Head Lighthouse guide vessels into?+
Takamatsu Detached Breakwater Southwest Head Lighthouse assists vessels approaching 5 nearby ports. The closest is Takamatsu at 0.7 NM to the WNW. Other ports served include Naoshima (6.9 NM NNW), Ieura (7.9 NM N), Hibi (8.4 NM NW), Tamano (8.8 NM NW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Takamatsu Detached Breakwater Southwest Head Lighthouse still active and maintained?+
Yes, Takamatsu Detached Breakwater Southwest Head 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 Takamatsu Detached Breakwater Southwest Head Lighthouse?+
Takamatsu Detached Breakwater Southwest Head 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 Takamatsu Detached Breakwater Southwest Head Lighthouse?+
You can track vessels near Takamatsu Detached Breakwater Southwest Head 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.