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Shimo Komaruko Shima Lighthouse

Fl (2) White 7s🇯🇵Imabari, JPOperational

Location & Light Range

About Shimo Komaruko Shima Lighthouse

Also known as: Shimo Komaruko Shima (Simo Komaru Koshima)

Constructed in 1962, this 8.5m concrete post is joined to a square, single-story concrete equipment building. The entire white structure reaches 21m above sea level and emits a white flash each seven seconds. Located on an island between Hakata Shima and Uma Shima, north of Ōshima, its light is visible for 13.4 nautical miles. The lighthouse is 2.6km from Hakatashima, its closest harbor, and is currently active, assisting craft in this island-filled sea area.

Why it matters: This lighthouse marks the narrow passage between Hakata Shima and Uma Shima. Its regular white flash provides a navigation marker, helping to avoid grounding and collisions in a restricted passage that is important for regional commerce and fishing boats.

Light & Optic

Characteristic Signature
Fl (2) White 7s
Flash Type
Flashing
Light Color
White
Flash Count
2 flashes
Interval
7s
Raw Code
Fl W 7s
Focal Height
21m
Geographic Range
13.4NM

Construction & History

Year Built
1962

References & Identifiers

Nearest Port
Hakatashima(2.6 km)
Admiralty No.
M5481
NGA No.
8580
ARLHS No.
JPN-2420

Tower & Structure

Tower Height
8.5m
Tower Shape
square
Tower Color
white
Material
concrete

Structure: A 8.5m concrete post attached to a square 1-story concrete equipment room. The entire lighthouse is white.

Location

City
Imabari
Country
🇯🇵Japan
Region
Ehime Prefecture
Sea Region
on an island in the narrow channel separating Hakata Shima and Uma Shima, two islands north of Ōshima
Latitude
34.2178°
Longitude
133.0569°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Shimo Komaruko Shima Lighthouse at night?+
Shimo Komaruko Shima displays the characteristic Fl (2) White 7s — 2 white flashes every 7 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 Shimo Komaruko Shima Lighthouse guide vessels into?+
Shimo Komaruko Shima Lighthouse assists vessels approaching 5 nearby ports. The closest is Hakatashima at 2.8 NM to the ESE. Other ports served include Inokuchi, Ehime (3.1 NM NNW), Yoshiumi (3.6 NM SSW), Kinoe (7.1 NM W), Saizaki (7.1 NM N). Mariners should consult the relevant chart for full approach and pilotage information.
Is Shimo Komaruko Shima Lighthouse still active and maintained?+
Yes, Shimo Komaruko 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 Shimo Komaruko Shima Lighthouse?+
Shimo Komaruko 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 Shimo Komaruko Shima Lighthouse?+
You can track vessels near Shimo Komaruko 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.