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Seonyudo Southwest Lighthouse

Fl (9) White 15s🇰🇷Gunsan-si, KROperational

Location & Light Range

About Seonyudo Southwest Lighthouse

This cylindrical concrete tower stands 12 meters high and is painted yellow with a black horizontal band. Located off the southwestern coast of Namdo near Gunsan-si, it guides vessels with a white light, producing one flash every 15 seconds. Its focal height reaches 11.9 meters, providing a geographic range of 11 nautical miles. The site is accessible, but the tower itself is closed to the public. This lighthouse is situated on a reef, serving as a marker in the Jeonbuk State region.

Why it matters: This lighthouse warns ships of a specific reef off the southwestern coast of Namdo, preventing groundings and ensuring the smooth flow of local shipping.

Light & Optic

Characteristic Signature
Fl (9) White 15s
Flash Type
Flashing
Light Color
White
Flash Count
9 flashes
Interval
15s
Raw Code
Fl W 15s
Focal Height
11.8872m
Geographic Range
11NM

Location

City
Gunsan-si
Country
🇰🇷South Korea
Region
Jeonbuk State
Sea Region
reef off the southwestern coast of Namdo
Latitude
35.8101°
Longitude
126.4004°

References & Identifiers

Nearest Port
Gunsan(13.4 km)
Admiralty No.
M4206.369.
NGA No.
M4206.369

Tower & Structure

Tower Height
12m
Tower Shape
cylindrical
Tower Color
yellow with a black horizontal band
Material
concrete

Structure: round concrete tower yellow with a black 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 Seonyudo Southwest Lighthouse at night?+
Seonyudo Southwest displays the characteristic Fl (9) White 15s — 9 white flashes every 15 seconds. 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 Seonyudo Southwest Lighthouse guide vessels into?+
Seonyudo Southwest Lighthouse assists vessels approaching 5 nearby ports. The closest is Gunsan at 13.5 NM to the NE. Other ports served include Sangwangdeungdo (16.2 NM SW), Janghang/Seocheon-gun (18.3 NM NE), Biin (18.8 NM NNE), Daecheon (30.8 NM N). Mariners should consult the relevant chart for full approach and pilotage information.
Is Seonyudo Southwest Lighthouse still active and maintained?+
Yes, Seonyudo Southwest 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.
How can I track vessels near Seonyudo Southwest Lighthouse?+
You can track vessels near Seonyudo Southwest 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.