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Iwa Shima Lighthouse

Fl (3) W 12s🇯🇵Yamaguchi, JPOperational

Location & Light Range

About Iwa Shima Lighthouse

This cylindrical stone lighthouse stands 10.5 meters tall and is painted white. Its light emits an isophase white, red, and green signal on a 6-second cycle. The focal height is 23 meters above sea level. The structure is operational and is located on a rocky islet. It serves as a navigational aid for vessels in the area.

Light & Optic

Characteristic Signature
Fl (3) W 12s
Flash Type
Flashing
Light Color
White
Flash Count
3 flashes
Interval
12s
Raw Code
Iso.W.R.G. period 6s
Focal Height
23m

Location

City
Yamaguchi
Country
🇯🇵JP
Latitude
33.9837°
Longitude
131.7526°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Shape
cylindrical
Tower Color
white
Material
stone

References & Identifiers

Admiralty No.
M5400
NGA No.
9520
ARLHS No.
JPN-1620
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Frequently Asked Questions

How do mariners identify Iwa Shima Lighthouse at night?+
Iwa Shima displays the characteristic Fl (3) W 12s — 3 white flashes every 12 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 Iwa Shima Lighthouse guide vessels into?+
Iwa Shima Lighthouse assists vessels approaching 5 nearby ports. The closest is Tonda at 3 NM to the N. Other ports served include Tokuyamakudamatsu (4 NM NNE), Tokuyama (4.4 NM NE), Kudamatsu (4.9 NM ENE), Tajiri (8.2 NM WNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Iwa Shima Lighthouse still active and maintained?+
Yes, Iwa 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 Iwa Shima Lighthouse?+
Iwa 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 Iwa Shima Lighthouse?+
You can track vessels near Iwa 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.