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Iwamatsu Kō Lighthouse

Fl Green 6s🇯🇵Uwajima, JPOperational

Location & Light Range

About Iwamatsu Kō Lighthouse

Also known as: Iwamatsu Kō (Usashi Breakwater)

This concrete cylindrical tower, standing 12 meters high, guides vessels into the port of Iwamatsu. Painted black with a single red horizontal band, it emits a green light. The lighthouse is situated at the end of the outer breakwater, marking the entrance to the deep inlet about 16 km south of Uwajima. Its focal plane is 11 meters above sea level, and it has a geographic range of 10.7 nautical miles. The site is open to the public, but the tower itself is closed.

Why it matters: Iwamatsu Kō is essential for the safe navigation of fishing boats and other vessels entering and leaving the port of Iwamatsu, marking the end of the outer breakwater.

Light & Optic

Characteristic Signature
Fl Green 6s
Flash Type
Flashing
Light Color
Green
Interval
6s
Raw Code
Fl G 6s
Focal Height
11m
Geographic Range
10.7NM

Location

City
Uwajima
Country
🇯🇵Japan
Region
Ehime Prefecture
Sea Region
Located at the end of the outer breakwater at Iwamatsu, a small port on a deep inlet about 16 km south of Uwajima.
Latitude
33.1277°
Longitude
132.4961°

References & Identifiers

Nearest Port
Iwamatsu(0.1 km)
Admiralty No.
M5614.3
NGA No.
10448
ARLHS No.
JPN-2409

Tower & Structure

Tower Height
12m
Tower Shape
cylindrical
Tower Color
black with one red horizontal band
Material
concrete

Structure: round cylindrical concrete tower painted black with one red horizontal band

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 Iwamatsu Kō Lighthouse at night?+
Iwamatsu Kō displays the characteristic Fl 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 Iwamatsu Kō Lighthouse guide vessels into?+
Iwamatsu Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Iwamatsu at 0.4 NM to the E. Other ports served include Hyakunoura (5.8 NM NNE), Aji (6.4 NM NNE), Nagimi (6.4 NM NNE), Uwajima (6.4 NM NNE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Iwamatsu Kō Lighthouse still active and maintained?+
Yes, Iwamatsu 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 Iwamatsu Kō Lighthouse?+
Iwamatsu 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 Iwamatsu Kō Lighthouse?+
You can track vessels near Iwamatsu 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.