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Ao Shima Lighthouse

Fl (2) White 8s🇯🇵Ozu, JPOperational

Location & Light Range

About Ao Shima Lighthouse

Also known as: Ao Shima (Iyo Aoshima)

This lighthouse stands atop an isolated, high island in Iyo Bay, about 20 kilometers west of the city of Iyo. The structure is a round white concrete tower measuring 12 meters high. Its light emits a single white flash every 8 seconds from a focal height of 102 meters, providing a geographic range of 25.1 nautical miles. This solitary tower is situated approximately 6.8 kilometers from the port of Nagahama, Ehime. Its operational status is confirmed, contributing to maritime safety in the region.

Why it matters: The lighthouse's elevated position and considerable range are critical for warning vessels of the island's presence and guiding them safely through Iyo Bay.

Light & Optic

Characteristic Signature
Fl (2) White 8s
Flash Type
Flashing
Light Color
White
Flash Count
2 flashes
Interval
8s
Raw Code
Fl W 8s
Focal Height
102m
Geographic Range
25.1NM

Location

City
Ozu
Country
🇯🇵Japan
Region
Ehime Prefecture
Sea Region
Located atop an isolated high island in Iyo Bay about 20 km west of Iyo.
Latitude
33.7358°
Longitude
132.4772°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
12m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round white concrete tower

References & Identifiers

Nearest Port
Nagahama, Ehime(6.8 km)
Admiralty No.
M5644.4
NGA No.
9144
ARLHS No.
JPN-192
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Frequently Asked Questions

How do mariners identify Ao Shima Lighthouse at night?+
Ao Shima displays the characteristic Fl (2) White 8s — 2 white flashes every 8 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 white color may indicate a specific sector or warning zone.
Which ports and harbors does Ao Shima Lighthouse guide vessels into?+
Ao Shima Lighthouse assists vessels approaching 5 nearby ports. The closest is Ihota at 12.9 NM to the N. Other ports served include Masaki (13.1 NM ENE), Mitsuhama (13.1 NM ENE), Matsuyama (14.5 NM NE), Ikata (16.4 NM SSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ao Shima Lighthouse still active and maintained?+
Yes, Ao Shima 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 Ao Shima Lighthouse?+
Ao Shima 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 Ao Shima Lighthouse?+
You can track vessels near Ao Shima 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.