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Sao Lighthouse

Fl W 5s🇰🇷Tsushima, KROperational

Location & Light Range

About Sao Lighthouse

This navigational aid is a green fiberglass mast situated on a pile. Constructed from glass-reinforced plastic, it stands 84 meters above the water. The light emits a single white flash every 5 seconds. Its geographic range extends to 23 nautical miles. The structure includes a topmark.

Light & Optic

Characteristic Signature
Fl W 5s
Flash Type
Flashing
Light Color
White
Flash Count
1 flash
Interval
5s
Raw Code
Fl.W. period 5s
Focal Height
84m
Geographic Range
23NM

Location

City
Tsushima
Country
🇰🇷KR
Latitude
34.6468°
Longitude
129.3206°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Shape
mast
Tower Color
green
Material
fiberglass

Structure: PORT (IALA B) Green glass reinforced plastic(grp) fiberglass tower, topmark, on pile

References & Identifiers

Admiralty No.
M5069.4
NGA No.
12472
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Frequently Asked Questions

How do mariners identify Sao Lighthouse at night?+
Sao displays the characteristic Fl W 5s — 1 white 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.
Which ports and harbors does Sao Lighthouse guide vessels into?+
Sao Lighthouse assists vessels approaching 5 nearby ports. The closest is Sasuna at 3.5 NM to the E. Other ports served include Oura/Uchinoura (5.8 NM ENE), Nita (6.8 NM S), Hitakatsu (7.5 NM E), Izumi, Aichi (7.8 NM ENE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Sao Lighthouse still active and maintained?+
Yes, Sao 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 Sao Lighthouse?+
Sao 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 Sao Lighthouse?+
You can track vessels near Sao 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.