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Ai Se Lighthouse

Fl White 5s🇯🇵Sasebo, JPOperational

Location & Light Range

About Ai Se Lighthouse

This lighthouse stands on a concrete, cylindrical tower 9.5 meters in height, attached to a small equipment shelter. The structure, painted white, is situated on a rocky reef about 3 kilometers south of Konoura harbor. Its light emits a single white flash every 5 seconds from a focal height of 15 meters. The geographic range of its light extends to 11.9 nautical miles. It is located in the Nagasaki Prefecture, near the city of Sasebo.

Why it matters: The lighthouse warns vessels of the hazardous rocky reef south of Konoura harbor, aiding safe navigation for marine traffic approaching the port.

Light & Optic

Characteristic Signature
Fl White 5s
Flash Type
Flashing
Light Color
White
Interval
5s
Raw Code
Fl W 5s
Focal Height
15m
Geographic Range
11.9NM

Location

City
Sasebo
Country
🇯🇵Japan
Region
Nagasaki Prefecture
Sea Region
rocky reef about 3 km south of Konoura harbor
Latitude
33.2347°
Longitude
129.0941°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

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

Structure: round conical concrete tower attached to a small equipment shelter

References & Identifiers

Nearest Port
Ojika(3.5 km)
Admiralty No.
M5016.4
NGA No.
12740
ARLHS No.
JPN-2152
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Frequently Asked Questions

How do mariners identify Ai Se Lighthouse at night?+
Ai Se displays the characteristic Fl White 5s. 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 Ai Se Lighthouse guide vessels into?+
Ai Se Lighthouse assists vessels approaching 5 nearby ports. The closest is Aokata at 15.2 NM to the S. Other ports served include Arikawa (15.2 NM S), Enokizu (15.2 NM S), Kata (15.2 NM S), Kozera (15.2 NM S). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ai Se Lighthouse still active and maintained?+
Yes, Ai Se 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 Ai Se Lighthouse?+
Ai Se 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 Ai Se Lighthouse?+
You can track vessels near Ai Se 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.