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Shido Kō Lighthouse

Fl green 4s🇯🇵Sanuki, JPOperational

Also known as: Sido

The red, round metal tower of Shido Kō Lighthouse was built in 1961 and stands 11 meters tall. It emits a single green flash. This operational light has a geographic range of 10.7 nautical miles. The lighthouse is located at the entrance to Shido Port in Sanuki, Kagawa Prefecture, Japan. The tower is closed to the public, but the surrounding site is accessible.

Why it matters: Shido Kō Lighthouse is essential for vessels navigating into and out of Shido Port, aiding local fishing and commercial traffic by marking potential hazards.

Characteristic Signature
Fl green 4s
Flash Type
Flashing
Light Color
green
Interval
4s
Raw Code
Fl.G
Focal Height
11m
Geographic Range
10.7NM
Year Built
1961
Open to public
Site open, tower closed
Flag
Type
Name
Dist.
Tower Shape
round
Tower Color
red
Material
metal

Structure: The Shido (Sido) Kō Lighthouse marks the entrance to the picturesque Shido Port in Japan, a vital point for local maritime activity. Established in 1961, this active light has faithfully guided countless vessels, from small fishing boats to larger commercial craft, through the coastal waters and into the safety of the harbor. Its presence is crucial for navigating the specific contours of the bay, ensuring clear passage and preventing groundings in an area that, like many Japanese coastal regions, can have intricate waterways. The lighthouse is situated in a setting that likely offers serene views of the Seto Inland Sea, with its characteristic calm waters, scattered islands, and verdant shores. Over the decades, it has become a familiar landmark for those who live and work along this stretch of coast. While the tower itself remains closed to the public, visitors are welcome to explore the surrounding site, offering a chance to appreciate its role in the local seascape and enjoy the peaceful atmosphere of the port. Its continuous operation since its inception highlights its enduring importance to the region's maritime heritage and economy.

City
Sanuki
Country
🇯🇵Japan
Region
Kagawa Prefecture
Sea Region
Shido Port, Japan
Latitude
34.3258°
Longitude
134.1772°
Nearest Port
Odahigashi(2.9 km)
Admiralty No.
M5546.8
NGA No.
8120
ARLHS No.
JPN-2468
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How do mariners identify Shido Kō Lighthouse at night?+
Shido Kō displays the characteristic Fl 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 Shido Kō Lighthouse guide vessels into?+
Shido Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Tsuda at 4.1 NM to the ESE. Other ports served include Takamatsu (7.1 NM WNW), Sanbonmatsu (9 NM ESE), Ikeda, Kagawa (9.2 NM NNE), Tonosho (9.5 NM N). Mariners should consult the relevant chart for full approach and pilotage information.
Is Shido Kō Lighthouse still active and maintained?+
Yes, Shido 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 Shido Kō Lighthouse?+
Shido 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 Shido Kō Lighthouse?+
You can track vessels near Shido 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.