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Sanuki Toyohama Kō Lighthouse

Oc Red 4s🇯🇵Kan-onji, JPOperational

Location & Light Range

About Sanuki Toyohama Kō Lighthouse

Also known as: Sanuki Toyohama Kō (West Breakwater)

This concrete lighthouse, built in 1955, stands 8 meters tall. It features a red cylindrical tower atop a square, single-story equipment shelter. The focal height of the light is 11 meters, and it emits an occulting red light that completes its cycle every 4 seconds. Located at the southern end of the west breakwater of Toyohama harbor in Kan'onji, this light guides vessels with a geographic range of 10.7 nautical miles. The site is open to visitors, though the tower itself is closed.

Why it matters: This lighthouse is essential for local fishing boats and other small vessels, marking the end of the breakwater to ensure safe entry and exit from Toyohama harbor.

Light & Optic

Characteristic Signature
Oc Red 4s
Flash Type
Occulting
Light Color
Red
Interval
4s
Raw Code
Oc R 4s
Focal Height
11m
Geographic Range
10.7NM

Construction & History

Year Built
1955

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
8m
Tower Shape
cylindrical
Tower Color
red
Material
concrete

Structure: An 8m red concrete post rising from a square 1-story concrete equipment shelter.

Location

City
Kan-onji
Country
🇯🇵Japan
Region
Kagawa Prefecture
Sea Region
end of the west (really south) breakwater of Toyohama harbor, in southern Kan'onji
Latitude
34.0814°
Longitude
133.6306°

References & Identifiers

Nearest Port
Toyohama, Kagawa(2.4 km)
Admiralty No.
M5490
NGA No.
8636
ARLHS No.
JPN-2467
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Frequently Asked Questions

How do mariners identify Sanuki Toyohama Kō Lighthouse at night?+
Sanuki Toyohama 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 Sanuki Toyohama Kō Lighthouse guide vessels into?+
Sanuki Toyohama Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Mishima, Kawanoe at 6.2 NM to the SW. Other ports served include Ishima (6.3 NM SW), Iyomishima (6.3 NM SW), Kawanoe (6.3 NM SW), Omishima (6.3 NM SW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Sanuki Toyohama Kō Lighthouse still active and maintained?+
Yes, Sanuki Toyohama 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 Sanuki Toyohama Kō Lighthouse?+
Sanuki Toyohama 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 Sanuki Toyohama Kō Lighthouse?+
You can track vessels near Sanuki Toyohama 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.