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Otakseo Lighthouse

Fl (2) White 5s🇰🇷Boryeong-si, KROperational

Location & Light Range

About Otakseo Lighthouse

This concrete lighthouse, built in 2008, stands 21 meters tall with its focal plane at 17 meters. Its distinctive black tower is accented by a red horizontal band. It emits a single white flash every 5 seconds, visible for 12.4 nautical miles. Located on a reef approximately 16 kilometers northwest of Nokdo, it lies within the South Chungcheong region. The site is accessible by boat, though the tower itself is closed to the public. The nearest port is Boryeong, 12 kilometers away.

Why it matters: This lighthouse marks a hazardous reef northwest of Nokdo, ensuring safer passage for vessels. A newer, taller tower was described in February 2024, indicating its ongoing importance for regional maritime safety.

Light & Optic

Characteristic Signature
Fl (2) White 5s
Flash Type
Flashing
Light Color
White
Flash Count
2 flashes
Interval
5s
Raw Code
Fl W 5s
Focal Height
17m
Geographic Range
12.4NM

Construction & History

Year Built
2008

Significant events: new, taller tower described in February 2024

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
21m
Tower Color
black with a red horizontal band
Material
concrete

Structure: concrete tower, painted black with a red horizontal band

Location

City
Boryeong-si
Country
🇰🇷South Korea
Region
South Chungcheong
Sea Region
reef about 16 km northwest of Nokdo
Latitude
36.3563°
Longitude
126.2398°

References & Identifiers

Nearest Port
Boryeong(12.0 km)
Admiralty No.
M4189.735
NGA No.
17831.5
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Frequently Asked Questions

How do mariners identify Otakseo Lighthouse at night?+
Otakseo displays the characteristic Fl (2) White 5s — 2 white flashes every 5 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 Otakseo Lighthouse guide vessels into?+
Otakseo Lighthouse assists vessels approaching 5 nearby ports. The closest is Boryeong at 11.8 NM to the ENE. Other ports served include Daecheon (12.8 NM E), Biin (18.6 NM SE), Gunsan (28.1 NM SE), Janghang/Seocheon-gun (30.2 NM SE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Otakseo Lighthouse still active and maintained?+
Yes, Otakseo 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 Otakseo Lighthouse?+
You can track vessels near Otakseo 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.