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Kosagishima Lighthouse

Fl W 4s🇯🇵Seto Naikai Eastern, JPOperational

Location & Light Range

About Kosagishima Lighthouse

Kosagishima lighthouse features a white, round masonry tower measuring 21 meters in height. Its light emits a single white flash on a 4-second cycle. The focal height of the light reaches 25 meters above sea level. This structure has been operational since its construction and serves the Seto Naikai Eastern region.

Light & Optic

Characteristic Signature
Fl W 4s
Flash Type
Flashing
Light Color
White
Flash Count
1 flash
Interval
4s
Raw Code
Fl.W. period 4s
Focal Height
25m
Light Range
7NM (13.0 km)
Geographic Range
7NM

Location

City
Seto Naikai Eastern
Country
🇯🇵JP
Latitude
34.3642°
Longitude
133.0996°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
21m
Tower Shape
round
Tower Color
white
Material
masonry

Structure: White round masonry tower; 21

References & Identifiers

Admiralty No.
M5716
NGA No.
8488
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Frequently Asked Questions

How far offshore can Kosagishima Lighthouse be seen?+
With a focal height of 25 meters and a nominal range of 7 nautical miles (approximately 13.0 km), Kosagishima is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. As a shorter-range light, it primarily serves nearshore and coastal traffic.
How do mariners identify Kosagishima Lighthouse at night?+
Kosagishima displays the characteristic Fl W 4s — 1 white flash every 4 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 Kosagishima Lighthouse guide vessels into?+
Kosagishima Lighthouse assists vessels approaching 5 nearby ports. The closest is Sunami at 0.9 NM to the WSW. Other ports served include Shigei (2.5 NM ESE), Saizaki (3.3 NM WSW), Itozaki (3.5 NM ENE), Nomi (3.5 NM ENE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Kosagishima Lighthouse still active and maintained?+
Yes, Kosagishima 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 Kosagishima Lighthouse?+
Kosagishima 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 Kosagishima Lighthouse?+
You can track vessels near Kosagishima 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.