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Udo Lighthouse

Fl White 20s🇰🇷Jeju, KROperational

Location & Light Range

About Udo Lighthouse

The Udo Lighthouse is a 7.5-meter cylindrical concrete tower painted white, first lit in 1906. Its focal height reaches 140 meters, providing a geographic range of 28.8 nautical miles. The light emits a white flash every 20 seconds. Situated on the southern tip of Udo island, it was constructed with an automated, acetylene-powered light source from its beginning, negating the need for a keeper's dwelling. Although inactive since 2003, the lighthouse site is open to visitors, offering views of the surrounding coastal area. The nearest port, Seongsan-po, is 1.9 kilometers away.

Why it matters: Its construction featuring an automated, acetylene-powered light from the outset represents an early adoption of technological advancement in lighthouse operation.

Light & Optic

Characteristic Signature
Fl White 20s
Flash Type
Flashing
Light Color
White
Interval
20s
Raw Code
Fl W 20s
Focal Height
140m
Geographic Range
28.8NM

Construction & History

Year Built
1906

Significant events: inactive since 2003

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
7.5m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round cylindrical concrete tower with lantern and gallery, painted white

Location

City
Jeju
Country
🇰🇷South Korea
Region
Jeju
Sea Region
southern tip of Udo
Latitude
33.4929°
Longitude
126.9652°

References & Identifiers

Nearest Port
Seongsan-po(1.9 km)
Admiralty No.
M4272
NGA No.
17420
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Frequently Asked Questions

How do mariners identify Udo Lighthouse at night?+
Udo displays the characteristic Fl White 20s. 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 Udo Lighthouse guide vessels into?+
Udo Lighthouse assists vessels approaching 5 nearby ports. The closest is Seongsan-po at 2.1 NM to the WSW. Other ports served include NAMWON (17.9 NM SW), Jeju (20.5 NM W), Kwangyang (21.6 NM W), Seogwipo (25.1 NM SW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Udo Lighthouse still active and maintained?+
Yes, Udo 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 Udo Lighthouse?+
You can track vessels near Udo 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.