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Tosa-okinoshima Lighthouse

Fl (2) W 20s🇯🇵Shikoku-South coast, JPOperational

Location & Light Range

About Tosa-okinoshima Lighthouse

This lighthouse stands 174 meters above sea level on the Shikoku-South coast. Its square tower is constructed of concrete and painted white with black accents. The structure includes a white tower with a black stripe and a white downward-pointing triangle as its daymark. The light emits two white flashes every 20 seconds.

Why it matters: The lighthouse provides a geographic range of 21 nautical miles.

Light & Optic

Characteristic Signature
Fl (2) W 20s
Flash Type
Flashing
Light Color
White
Flash Count
2 flashes
Interval
20s
Raw Code
Fl.(2)W. period 20s
Focal Height
174m
Light Range
21NM (38.9 km)
Geographic Range
21NM

Location

City
Shikoku-South coast
Country
🇯🇵JP
Latitude
32.7043°
Longitude
132.5432°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Shape
square
Tower Color
white and black
Material
concrete

Structure: White tower, white triangle, point down daymark black stripe

References & Identifiers

Admiralty No.
M5610
NGA No.
10332
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Frequently Asked Questions

How far offshore can Tosa-okinoshima Lighthouse be seen?+
With a focal height of 174 meters and a nominal range of 21 nautical miles (approximately 38.9 km), Tosa-okinoshima 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 Tosa-okinoshima Lighthouse at night?+
Tosa-okinoshima displays the characteristic Fl (2) W 20s — 2 white flashes every 20 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 Tosa-okinoshima Lighthouse guide vessels into?+
Tosa-okinoshima Lighthouse assists vessels approaching 5 nearby ports. The closest is Issai at 6.9 NM to the NE. Other ports served include Kozukushi (13.9 NM NE), Ozuku (13.9 NM NE), Fukaura, Ehime (14.6 NM N), Ikeshima (14.9 NM NNE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Tosa-okinoshima Lighthouse still active and maintained?+
Yes, Tosa-okinoshima 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 Tosa-okinoshima Lighthouse?+
Tosa-okinoshima 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 Tosa-okinoshima Lighthouse?+
You can track vessels near Tosa-okinoshima 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.