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Onaka Seto North Lighthouse

Fl (2) Green 6s🇯🇵Nagasaki, JPOperational

Location & Light Range

About Onaka Seto North Lighthouse

This concrete lighthouse, built in 1969, stands 8.5 meters tall on a reef at the north end of the strait separating Io Shima from the Onaka Seto Peninsula. Its cylindrical, red tower flares at the top and is attached to an equipment shelter. The light emits a single green flash every 6 seconds, visible for 11.6 nautical miles. The structure's focal height is 14 meters above sea level. It is located 0.2 kilometers from the nearest port in Nagasaki.

Why it matters: This lighthouse is essential for safe navigation through the strait separating Io Shima from the Onaka Seto Peninsula, specifically warning mariners of the reef at its northern end. Its distinctive flared top adds a unique architectural detail to its functional design.

Light & Optic

Characteristic Signature
Fl (2) Green 6s
Flash Type
Flashing
Light Color
Green
Flash Count
2 flashes
Interval
6s
Raw Code
Fl G 6s
Focal Height
14m
Geographic Range
11.6NM

Construction & History

Year Built
1969

References & Identifiers

Nearest Port
Nagasaki(0.2 km)

Tower & Structure

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

Structure: round concrete tower, flared at the top, attached to a small equipment shelter

Location

City
Nagasaki
Country
🇯🇵Japan
Region
Nagasaki Prefecture
Sea Region
On a reef at the north end of the strait separating Io Shima from the Onaka Seto Peninsula of the mainland.
Latitude
32.7148°
Longitude
129.8172°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Onaka Seto North Lighthouse at night?+
Onaka Seto North displays the characteristic Fl (2) Green 6s — 2 green flashes every 6 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 Onaka Seto North Lighthouse guide vessels into?+
Onaka Seto North Lighthouse assists vessels approaching 5 nearby ports. The closest is Nagasaki at 1.4 NM to the ENE. Other ports served include Aikawa, Nagasaki (1.7 NM E), Furue, Nagasaki (1.7 NM E), Furusato, Nagasaki (1.7 NM E), Fukue, Nagasaki (1.7 NM E). Mariners should consult the relevant chart for full approach and pilotage information.
Is Onaka Seto North Lighthouse still active and maintained?+
Yes, Onaka Seto North 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 Onaka Seto North Lighthouse?+
Onaka Seto North 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 Onaka Seto North Lighthouse?+
You can track vessels near Onaka Seto North 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.