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Otabushima Lighthouse

Iso W 6s🇯🇵Seto Naikai Eastern, JPOperational

Location & Light Range

About Otabushima Lighthouse

The Otabushima Lighthouse stands 31 meters tall with a focal height of 31 meters. Its structure is a white tower, 36 units in height. The light displayed is white, characterized as isophase. This means it has an isophase white light on a 6-second cycle. The lighthouse is operational and is located in Seto Naikai Eastern.

Why it matters: This lighthouse provides a geographic range of 16 nautical miles.

Light & Optic

Characteristic Signature
Iso W 6s
Flash Type
Isophase
Light Color
White
Flash Count
1 flash
Interval
6s
Raw Code
Iso
Focal Height
31m
Light Range
14NM (25.9 km)
Geographic Range
16NM

Location

City
Seto Naikai Eastern
Country
🇯🇵JP
Latitude
34.6806°
Longitude
134.2952°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
31m
Tower Color
white

Structure: White tower; 36

References & Identifiers

Admiralty No.
M5754.85
NGA No.
7826
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Frequently Asked Questions

How far offshore can Otabushima Lighthouse be seen?+
With a focal height of 31 meters and a nominal range of 14 nautical miles (approximately 25.9 km), Otabushima is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. This range makes it a significant coastal navigation aid for vessels transiting the area.
How do mariners identify Otabushima Lighthouse at night?+
Otabushima displays the characteristic Iso W 6s — 1 white flash every 6 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 Otabushima Lighthouse guide vessels into?+
Otabushima Lighthouse assists vessels approaching 5 nearby ports. The closest is Hinase at 3.1 NM to the NNW. Other ports served include Kugui (5.4 NM WNW), Katakami (5.9 NM WNW), Akoh (6 NM ENE), Bizen (6.4 NM WNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Otabushima Lighthouse still active and maintained?+
Yes, Otabushima 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 Otabushima Lighthouse?+
Otabushima 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 Otabushima Lighthouse?+
You can track vessels near Otabushima 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.