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Sobiyo Lighthouse

Fl Red 4s🇰🇷Jeju, KROperational

Location & Light Range

About Sobiyo Lighthouse

Also known as: Sobiyo (Seobiyeo)

A 10-meter cylindrical concrete tower, the Sobiyo Lighthouse stands 12 meters above sea level. Its construction features a yellow lower half and a black upper half. The lighthouse emits a single red flash every 4 seconds, visible for 11 nautical miles. It is located on a reef about 1200 meters north of Biyangdo, off the coast of Jeju. While the site is accessible by boat, the tower itself is closed to visitors. The nearest port, Hwasun, is 11.7 kilometers away.

Why it matters: The Sobiyo Lighthouse marks a reef north of Biyangdo, serving as a visual warning to prevent groundings and ensure the safety of maritime traffic in this area.

Light & Optic

Characteristic Signature
Fl Red 4s
Flash Type
Flashing
Light Color
Red
Interval
4s
Raw Code
Fl R 4s
Focal Height
12m
Geographic Range
11NM

Location

City
Jeju
Country
🇰🇷South Korea
Region
Jeju
Sea Region
reef about 1200 m north of Biyangdo, South Korea
Latitude
33.4123°
Longitude
126.2271°

References & Identifiers

Nearest Port
Hwasun(11.7 km)
Admiralty No.
M4257
NGA No.
17508

Tower & Structure

Tower Height
10m
Tower Shape
cylindrical
Tower Color
red
Material
concrete

Structure: round concrete tower, upper half painted black, lower half yellow

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 Sobiyo Lighthouse at night?+
Sobiyo displays the characteristic Fl 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 Sobiyo Lighthouse guide vessels into?+
Sobiyo Lighthouse assists vessels approaching 5 nearby ports. The closest is Hallim at 1.2 NM to the ENE. Other ports served include Aewol (5 NM ENE), HWASUN (11.8 NM SSE), Hwasun (12 NM SSE), Kwangyang (16.2 NM ENE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Sobiyo Lighthouse still active and maintained?+
Yes, Sobiyo 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 Sobiyo Lighthouse?+
You can track vessels near Sobiyo 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.