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Kosei Shima Lighthouse

Fl White 3s🇯🇵Sakaide, JPOperational

Location & Light Range

About Kosei Shima Lighthouse

This lighthouse, built in 1968, is a white, cylindrical concrete tower standing 12 meters tall. It features two galleries and its light is positioned 27 meters above sea level. The structure is located on an island approximately 6 kilometers northeast of Sakaide. It emits a single white flash every three seconds, visible for 14.7 nautical miles. The lighthouse is situated near the port of Sakaide, 1.1 kilometers away.

Why it matters: The Kosei Shima lighthouse aids vessels navigating the Bisan-Seto strait, a dangerous passage within the Inland Sea known for its complex currents and numerous islands.

Light & Optic

Characteristic Signature
Fl White 3s
Flash Type
Flashing
Light Color
White
Interval
3s
Raw Code
Fl W 3s
Focal Height
27m
Geographic Range
14.7NM

Construction & History

Year Built
1968

References & Identifiers

Nearest Port
Sakaide(1.1 km)
ARLHS No.
JPN-2448

Tower & Structure

Tower Height
12m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round cylindrical concrete tower with two galleries

Location

City
Sakaide
Country
🇯🇵Japan
Region
Kagawa Prefecture
Sea Region
Helps guide vessels in the Bisan-Seto strait, one of the most dangerous passages of the Inland Sea. Located on an island about 6 km northeast of Sakaide.
Latitude
34.3737°
Longitude
133.8520°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Kosei Shima Lighthouse at night?+
Kosei Shima displays the characteristic Fl White 3s. 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 white color may indicate a specific sector or warning zone.
Which ports and harbors does Kosei Shima Lighthouse guide vessels into?+
Kosei Shima Lighthouse assists vessels approaching 5 nearby ports. The closest is Sakaide at 2.2 NM to the S. Other ports served include Utazu (2.4 NM S), Shimotsui (4.7 NM NW), Shibukawa (5.5 NM NNE), Aoki (5.6 NM SW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Kosei Shima Lighthouse still active and maintained?+
Yes, Kosei Shima 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 Kosei Shima Lighthouse?+
Kosei Shima 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 Kosei Shima Lighthouse?+
You can track vessels near Kosei Shima 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.