Get the MarineRadar appSatellite AISSatellite live trackingTrack any shipLive alerts112,000+ ships trackedDownload free

Iyu Mizukoshi Shima Lighthouse

Fl White 5s🇯🇵Seiyo, JPOperational

Location & Light Range

About Iyu Mizukoshi Shima Lighthouse

A white, cylindrical concrete tower, 8.5 meters in height, is situated on a small islet in Hokezu Bay. The light source is positioned 16 meters above sea level. This structure emits a white light with a characteristic of a single flash every 5 seconds, visible up to 12.2 nautical miles. It is a rectangular, white concrete tower located in Ehime Prefecture, Japan, identifying a point between Uwajima and Seiyo. The islet can be visited, but the tower interior is not open. Nagimi port is 2.5 kilometers distant.

Why it matters: This lighthouse functions as a navigation aid in Hokezu Bay, assisting vessels moving between Uwajima and Seiyo. Its illumination assists local fishing craft and other watercraft in following their routes and circumventing dangers within the bay.

Light & Optic

Characteristic Signature
Fl White 5s
Flash Type
Flashing
Light Color
White
Interval
5s
Raw Code
Fl W 5s
Focal Height
16m
Geographic Range
12.2NM

Location

City
Seiyo
Country
🇯🇵Japan
Region
Ehime Prefecture
Sea Region
Hokezu Bay, separating Uwajima from Seiyo, atop an islet.
Latitude
33.3080°
Longitude
132.4865°

References & Identifiers

Nearest Port
Nagimi(2.5 km)
Admiralty No.
M5621.4
NGA No.
10404

Tower & Structure

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

Structure: rectangular cylindrical white concrete tower

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.
Live tracking · 50,000+ mariners

Find Iyu Mizukoshi Shima Lighthouse on the live nautical map

Plan voyages near Japan, see nearby vessels in real time, and explore 14,900+ navigation aids in the app.

Nautical mapNearby vesselsVoyage planning
Get the App

Frequently Asked Questions

How do mariners identify Iyu Mizukoshi Shima Lighthouse at night?+
Iyu Mizukoshi Shima displays the characteristic Fl White 5s. 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 Iyu Mizukoshi Shima Lighthouse guide vessels into?+
Iyu Mizukoshi Shima Lighthouse assists vessels approaching 5 nearby ports. The closest is Tamatsu, Ehime at 1.5 NM to the E. Other ports served include Yoshida, Ehime (3.4 NM SE), Hyakunoura (5.6 NM SSE), Uwajima (5.9 NM SSE), Aji (6.8 NM SE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Iyu Mizukoshi Shima Lighthouse still active and maintained?+
Yes, Iyu Mizukoshi 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 Iyu Mizukoshi Shima Lighthouse?+
Iyu Mizukoshi 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 Iyu Mizukoshi Shima Lighthouse?+
You can track vessels near Iyu Mizukoshi 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.