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Seul Do Lighthouse

Fl R 5s🇰🇷Ulsan, KROperational

Location & Light Range

About Seul Do Lighthouse

Seul Do Lighthouse is a red, round concrete tower that stands 43 meters in height. It emits a single red flash every 5 seconds. The structure's focal height reaches 16 meters above sea level. The lighthouse is operational and constructed from concrete.

Why it matters: This lighthouse offers a geographic range of 11 nautical miles.

Light & Optic

Characteristic Signature
Fl R 5s
Flash Type
Flashing
Light Color
Red
Flash Count
1 flash
Interval
5s
Raw Code
Fl.R. period 5s
Focal Height
16m
Geographic Range
11NM

Location

City
Ulsan
Country
🇰🇷KR
Latitude
35.4782°
Longitude
129.4279°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
43m
Tower Shape
round
Tower Color
red
Material
concrete

Structure: Red round concrete tower; 43

References & Identifiers

Admiralty No.
M4389
NGA No.
16686
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Frequently Asked Questions

How do mariners identify Seul Do Lighthouse at night?+
Seul Do displays the characteristic Fl R 5s — 1 red flash 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 red color may indicate a specific sector or warning zone.
Which ports and harbors does Seul Do Lighthouse guide vessels into?+
Seul Do Lighthouse assists vessels approaching 5 nearby ports. The closest is Mipo/Ulsan at 2.3 NM to the N. Other ports served include Ulsan (3 NM NW), Onsan/Ulsan (4 NM SW), Busanjin-Gu (27 NM SW), South Busan (27.3 NM SSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Seul Do Lighthouse still active and maintained?+
Yes, Seul Do 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 Seul Do Lighthouse?+
Seul Do 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 Seul Do Lighthouse?+
You can track vessels near Seul Do 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.