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Ai Shima Lighthouse

Occ W 4s🇯🇵Ehime (Western Shikoku), JPOperational

Location & Light Range

About Ai Shima Lighthouse

Ai Shima Lighthouse is a concrete tower built in 2022, standing 36 meters tall. Its focal plane is 65 meters above sea level, and it emits a geographic range of 12 nautical miles. The light displays four flashes—white, red, and green—repeating every 12 seconds. This round, white structure is situated on a small, inhabited island in Aki Bay. Access to the island is exclusively by boat.

Light & Optic

Characteristic Signature
Occ W 4s
Flash Type
Occ
Light Color
White
Flash Count
1 flash
Interval
4s
Raw Code
Fl.(4)W.R.G. period 12s
Focal Height
65m
Geographic Range
12NM

Construction & History

Year Built
2022

References & Identifiers

Admiralty No.
M5445
NGA No.
8896
ARLHS No.
JPN-006

Tower & Structure

Tower Height
36m
Tower Shape
round
Tower Color
white
Material
concrete

Structure: White tower; 36

Location

City
Ehime (Western Shikoku)
Country
🇯🇵JP
Latitude
34.0709°
Longitude
132.7109°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Ai Shima Lighthouse at night?+
Ai Shima displays the characteristic Occ W 4s — 1 white flash every 4 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.
Which ports and harbors does Ai Shima Lighthouse guide vessels into?+
Ai Shima Lighthouse assists vessels approaching 5 nearby ports. The closest is Hojo at 6.2 NM to the SSE. Other ports served include Kikuma (6.6 NM ESE), Osako (7.3 NM WNW), Kamagari (7.7 NM N), Tainouchi (8.7 NM WNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ai Shima Lighthouse still active and maintained?+
Yes, Ai 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 Ai Shima Lighthouse?+
Ai 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 Ai Shima Lighthouse?+
You can track vessels near Ai 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.