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Shiode Iso Lighthouse

Fl Red 8s🇯🇵Matsuyama, JPOperational

Location & Light Range

About Shiode Iso Lighthouse

The Shiode Iso lighthouse is a 12-meter high, red, cylindrical concrete tower with a double gallery, set on a round concrete pier. It is positioned on a reef northwest of Asanami. The light characteristic is a red flash every 8 seconds, with a visible range of 11.9 nautical miles. Operational, the site is open to visitors arriving by boat from Hojo port, located 2.3 kilometers distant, but the tower remains closed to the public.

Why it matters: This lighthouse marks a reef northwest of Asanami, providing a navigation aid for local maritime traffic and warning vessels of underwater dangers.

Light & Optic

Characteristic Signature
Fl Red 8s
Flash Type
Flashing
Light Color
Red
Interval
8s
Raw Code
Fl R 8s
Focal Height
15m
Geographic Range
11.9NM

Location

City
Matsuyama
Country
🇯🇵Japan
Region
Ehime Prefecture
Sea Region
Located on a reef northwest of Asanami.
Latitude
34.0153°
Longitude
132.7896°

References & Identifiers

Nearest Port
Hojo(2.3 km)
Admiralty No.
M5447
NGA No.
8792

Tower & Structure

Tower Height
12m
Tower Shape
cylindrical
Tower Color
red
Material
concrete

Structure: round cylindrical concrete tower with double gallery, mounted on a round concrete pier

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Shiode Iso Lighthouse at night?+
Shiode Iso displays the characteristic Fl Red 8s. 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 red color may indicate a specific sector or warning zone.
Which ports and harbors does Shiode Iso Lighthouse guide vessels into?+
Shiode Iso Lighthouse assists vessels approaching 5 nearby ports. The closest is Hojo at 2.2 NM to the SSW. Other ports served include Kikuma (2.5 NM ENE), Matsuyama (9.1 NM SSW), Namikata (10.5 NM NE), Hashihama (10.7 NM ENE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Shiode Iso Lighthouse still active and maintained?+
Yes, Shiode Iso 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 Shiode Iso Lighthouse?+
Shiode Iso 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 Shiode Iso Lighthouse?+
You can track vessels near Shiode Iso 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.