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Umashima Lighthouse

Fl (2) Alt 12s🇯🇵Honshu-Northwest Coast, JPOperational

Location & Light Range

About Umashima Lighthouse

This lighthouse features a quadrilateral latticed tower built from fiberglass, standing 34 meters high. Its exterior is painted white and green and includes a rectangular daymark in matching colors. The lighthouse emits an alternating white and green light, showing one white flash followed by one green flash every 12 seconds. The focal height of the light is 34 meters, and its geographic range extends to 7 nautical miles.

Light & Optic

Characteristic Signature
Fl (2) Alt 12s
Flash Type
Flashing
Light Color
Alt
Flash Count
2 flashes
Interval
12s
Raw Code
Fl.W.G. period 12s
Focal Height
34m
Light Range
16NM (29.6 km)
Geographic Range
7NM

Location

City
Honshu-Northwest Coast
Country
🇯🇵JP
Latitude
34.9036°
Longitude
132.0480°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Shape
quadrilateral
Tower Color
white and green
Material
fiberglass

Structure: Quadrilateral latticed tower, green and white rectangular daymark

References & Identifiers

Admiralty No.
M7348
NGA No.
1824
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Frequently Asked Questions

How far offshore can Umashima Lighthouse be seen?+
With a focal height of 34 meters and a nominal range of 16 nautical miles (approximately 29.6 km), Umashima is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. Lights of this range are typically used as landfall lights by vessels approaching from the open sea.
How do mariners identify Umashima Lighthouse at night?+
Umashima displays the characteristic Fl (2) Alt 12s — 2 alt 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. The alt color may indicate a specific sector or warning zone.
Which ports and harbors does Umashima Lighthouse guide vessels into?+
Umashima Lighthouse assists vessels approaching 5 nearby ports. The closest is Hamada at 1.7 NM to the S. Other ports served include Yoshiura (5.8 NM SW), Misumi, Shimane (9.2 NM SW), Masuda, Shimane (17 NM SW), Yunotsu (18.4 NM NE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Umashima Lighthouse still active and maintained?+
Yes, Umashima 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 Umashima Lighthouse?+
Umashima 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 Umashima Lighthouse?+
You can track vessels near Umashima 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.