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Ohunakoshi Lighthouse

Fl G 3s🇰🇷Tsushima, KROperational

Location & Light Range

About Ohunakoshi Lighthouse

Ohunakoshi is a concrete lighthouse located in Tsushima. Its square tower is painted in white, black, and green sections. The structure features a three-pile dolphin with a square daymark. The light emits a green flash every 3 seconds. The focal height is 11 meters, and it has a geographic range of 3 nautical miles.

Light & Optic

Characteristic Signature
Fl G 3s
Flash Type
Flashing
Light Color
Green
Flash Count
1 flash
Interval
3s
Raw Code
Fl.G. period 3s
Focal Height
11m
Geographic Range
3NM

Location

City
Tsushima
Country
🇰🇷KR
Latitude
34.2759°
Longitude
129.3545°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Shape
square
Tower Color
white and black and green
Material
concrete

Structure: Three-pile dolphin, green, white, and black square daymark. DISCOVERY PASSAGE:

References & Identifiers

Admiralty No.
M5051
NGA No.
12556
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Frequently Asked Questions

How do mariners identify Ohunakoshi Lighthouse at night?+
Ohunakoshi displays the characteristic Fl G 3s — 1 green flash every 3 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 green color may indicate a specific sector or warning zone.
Which ports and harbors does Ohunakoshi Lighthouse guide vessels into?+
Ohunakoshi Lighthouse assists vessels approaching 5 nearby ports. The closest is Kusubo at 1.5 NM to the NNE. Other ports served include Kechi (1.9 NM WSW), Takeshiki (2.9 NM WNW), Kamoise (3.8 NM NNE), Koura, Kagawa (4.3 NM SW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ohunakoshi Lighthouse still active and maintained?+
Yes, Ohunakoshi 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 Ohunakoshi Lighthouse?+
Ohunakoshi 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 Ohunakoshi Lighthouse?+
You can track vessels near Ohunakoshi 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.