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Hario Seto Lighthouse

Fl White 3s🇯🇵Saikai, JPOperational

Location & Light Range

About Hario Seto Lighthouse

Also known as: Hario Seto (Hario Bentenjima)

This lighthouse is a white cylindrical concrete post, 8.5 meters tall, situated on a reef. It rises from a round concrete equipment shelter. The light emits a single white flash every 3 seconds and has a geographic range of 12.2 nautical miles. Its focal height is 16 meters above sea level. The site is accessible, but the tower is closed to visitors. It stands in the channel leading to Ōmura Bay, southeast of Sasebo, Japan.

Why it matters: This light marks a reef in the channel leading to Ōmura Bay, an important waterway southeast of Sasebo, Japan.

Light & Optic

Characteristic Signature
Fl White 3s
Flash Type
Flashing
Light Color
White
Interval
3s
Raw Code
Fl W 3s
Focal Height
16m
Geographic Range
12.2NM

Location

City
Saikai
Country
🇯🇵Japan
Region
Nagasaki Prefecture
Sea Region
A reef in the channel leading to Ōmura Bay, an almost totally-enclosed bay southeast of Sasebo, Japan.
Latitude
33.0602°
Longitude
129.7516°

References & Identifiers

Nearest Port
Tainoura(1.1 km)

Tower & Structure

Tower Height
8.5m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: A 8.5m cylindrical concrete post rising from a round concrete equipment shelter, painted white.

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Hario Seto Lighthouse at night?+
Hario Seto 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 Hario Seto Lighthouse guide vessels into?+
Hario Seto Lighthouse assists vessels approaching 5 nearby ports. The closest is Miyaura at 3.6 NM to the SSE. Other ports served include Omodaka (4.2 NM WNW), Kawatana (5.6 NM E), Sasebo (6.1 NM NNW), Haiki (6.6 NM NNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Hario Seto Lighthouse still active and maintained?+
Yes, Hario Seto 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 Hario Seto Lighthouse?+
Hario Seto 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 Hario Seto Lighthouse?+
You can track vessels near Hario Seto 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.