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Imo Saki Lighthouse

Fl White 3s🇯🇵Tsushima, JPOperational

Location & Light Range

About Imo Saki Lighthouse

This lighthouse is a cylindrical concrete tower, painted white, standing 10 meters tall. It was built and first lit in 1977. The structure consists of the round tower attached to a single-story equipment room. Located at the tip of a long peninsula projecting into the south side of Asō Bay, it is situated in Nagasaki Prefecture, near Tsushima. The light emits a single white flash every 3 seconds and has a geographic range of 11.3 nautical miles. The site is open to the public, but the tower itself is closed.

Why it matters: This lighthouse is essential for mariners navigating the southern part of Asō Bay, clearly marking the peninsula's extreme point.

Light & Optic

Characteristic Signature
Fl White 3s
Flash Type
Flashing
Light Color
White
Interval
3s
Raw Code
Fl W 3s
Focal Height
13m
Geographic Range
11.3NM

Construction & History

Year Built
1977

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
10m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round concrete tower attached to a small 1-story equipment room

Location

City
Tsushima
Country
🇯🇵Japan
Region
Nagasaki Prefecture
Sea Region
Located at the tip of a long peninsula projecting into the south side of Asō Bay.
Latitude
34.3282°
Longitude
129.2667°

References & Identifiers

Nearest Port
Hirugaura(0.6 km)
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Frequently Asked Questions

How do mariners identify Imo Saki Lighthouse at night?+
Imo Saki displays the characteristic Fl White 3s. 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 Imo Saki Lighthouse guide vessels into?+
Imo Saki Lighthouse assists vessels approaching 5 nearby ports. The closest is Hirugaura at 0.6 NM to the SE. Other ports served include Mizusaki (1.6 NM N), Osaki, Miyagi (2.2 NM WSW), Takeshiki (2.5 NM SE), Imazato (2.8 NM SW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Imo Saki Lighthouse still active and maintained?+
Yes, Imo Saki 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 Imo Saki Lighthouse?+
Imo Saki 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 Imo Saki Lighthouse?+
You can track vessels near Imo Saki 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.