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Sasuna Kō Lighthouse

F White 6s🇯🇵Tsushima, JPOperational

Location & Light Range

About Sasuna Kō Lighthouse

Sasuna Kō Lighthouse is a 9.5 meter white concrete post situated atop a round, 1-story concrete equipment room. It was built and first lit in 1966 on a rocky ledge north of the Sasuna harbor entrance. The lighthouse emits a single white flash every six seconds from a focal height of 11 meters. Its geographic range extends to 10.7 nautical miles. The site is open to the public, though the tower itself remains closed. The lighthouse is located on the north side of the entrance to Sasuna harbor, approximately 5.5 km east of Sao Saki.

Why it matters: This lighthouse is important for vessels entering and exiting Sasuna harbor, clearly marking the channel entrance.

Light & Optic

Characteristic Signature
F White 6s
Flash Type
Fixed
Light Color
White
Interval
6s
Raw Code
F.Fl W 6s
Focal Height
11m
Geographic Range
10.7NM

Construction & History

Year Built
1966

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
9.5m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: A 9.5 m concrete post centered on a round 1-story concrete equipment room, painted white.

Location

City
Tsushima
Country
🇯🇵Japan
Region
Nagasaki Prefecture
Sea Region
Located on a rocky ledge on the north side of the entrance to Sasuna harbor, about 5.5 km (3.5 mi) east of Sao Saki. Easily seen from the coastal road leading northwest from Sasuna.
Latitude
34.6460°
Longitude
129.3831°

References & Identifiers

Nearest Port
Sasuna(0.3 km)
Admiralty No.
M5069
NGA No.
12476
ARLHS No.
JPN-2260
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Frequently Asked Questions

How do mariners identify Sasuna Kō Lighthouse at night?+
Sasuna Kō displays the characteristic F White 6s. 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 Sasuna Kō Lighthouse guide vessels into?+
Sasuna Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Sasuna at 0.4 NM to the ESE. Other ports served include Oura/Uchinoura (3 NM NE), Hitakatsu (4.5 NM E), Izumi, Aichi (4.9 NM ENE), Izumi (4.9 NM ENE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Sasuna Kō Lighthouse still active and maintained?+
Yes, Sasuna Kō 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 Sasuna Kō Lighthouse?+
Sasuna Kō 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 Sasuna Kō Lighthouse?+
You can track vessels near Sasuna Kō 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.