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Owari Ō Iso Lighthouse

Fl White 15s🇯🇵Minamichita, JPOperational

Location & Light Range

About Owari Ō Iso Lighthouse

Owari Ō Iso is a cylindrical concrete tower standing 9 meters tall, painted yellow with a single black horizontal band. It is situated on a reef at the entrance to Atsumi Bay, marking the passage between Saku Shima and Himaka Shima. The light emits a white flash every 15 seconds from a focal height of 10 meters, with a geographic range of 10.4 nautical miles. The site is open to visitors, but the tower itself is closed to the public. The nearest port is Shinojima, approximately 2 kilometers away.

Why it matters: This lighthouse is essential for safe navigation through the narrow passage between Saku Shima and Himaka Shima, directly at the entrance to Atsumi Bay, warning mariners of the reef it marks.

Light & Optic

Characteristic Signature
Fl White 15s
Flash Type
Flashing
Light Color
White
Interval
15s
Raw Code
Fl W 15s
Focal Height
10m
Geographic Range
10.4NM

Location

City
Minamichita
Country
🇯🇵Japan
Region
Aichi Prefecture
Sea Region
A reef in the passage between Saku Shima and Himaka Shima at the entrance to Atsumi Bay
Latitude
34.7136°
Longitude
137.0196°

References & Identifiers

Nearest Port
Shinojima(2.0 km)
Admiralty No.
M6160.6
NGA No.
6056

Tower & Structure

Tower Height
9m
Tower Shape
cylindrical
Tower Color
yellow with one black horizontal band
Material
concrete

Structure: round cylindrical concrete tower with gallery

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 Owari Ō Iso Lighthouse at night?+
Owari Ō Iso displays the characteristic Fl White 15s. 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 Owari Ō Iso Lighthouse guide vessels into?+
Owari Ō Iso Lighthouse assists vessels approaching 5 nearby ports. The closest is Morozaki at 2.3 NM to the WSW. Other ports served include Toyohama, Aichi (4.1 NM W), Yoshida, Aichi (5.2 NM NE), Kowa (5.6 NM WNW), Fukue, Aichi (6.2 NM SE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Owari Ō Iso Lighthouse still active and maintained?+
Yes, Owari Ō Iso 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 Owari Ō Iso Lighthouse?+
Owari Ō Iso 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 Owari Ō Iso Lighthouse?+
You can track vessels near Owari Ō Iso 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.