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Oishi Lighthouse

Fl (2) Green 8s🇯🇵Suo-Oshima, JPOperational

Location & Light Range

About Oishi Lighthouse

Also known as: Oishi (Oisi)

Oishi Lighthouse is a 10-meter-tall cylindrical concrete tower located on a reef off the southeastern tip of Yashiro Shima, near Suo-Oshima in Japan's Yamaguchi Prefecture. It stands on a round concrete pier, with its light positioned 13 meters above sea level. This active lighthouse emits a single green flash every 8 seconds, visible for 11.3 nautical miles. The site is open to visitors, but the tower itself is closed. Access to the lighthouse is by boat, with the nearest port being Ihota, 2.2 kilometers away.

Why it matters: This lighthouse is important for local shipping, marking a reef off Yashiro Shima's southeastern tip.

Light & Optic

Characteristic Signature
Fl (2) Green 8s
Flash Type
Flashing
Light Color
Green
Flash Count
2 flashes
Interval
8s
Raw Code
Fl G 8s
Focal Height
13m
Geographic Range
11.3NM

Location

City
Suo-Oshima
Country
🇯🇵Japan
Region
Yamaguchi Prefecture
Sea Region
A reef off the southeastern tip of Yashiro Shima.
Latitude
33.9190°
Longitude
132.4718°

References & Identifiers

Nearest Port
Ihota(2.2 km)
Admiralty No.
M5645.4
NGA No.
9192

Tower & Structure

Tower Height
10m
Tower Shape
cylindrical
Tower Color
green
Material
concrete

Structure: round concrete tower, 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 Oishi Lighthouse at night?+
Oishi displays the characteristic Fl (2) Green 8s — 2 green flashes every 8 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 green color may indicate a specific sector or warning zone.
Which ports and harbors does Oishi Lighthouse guide vessels into?+
Oishi Lighthouse assists vessels approaching 5 nearby ports. The closest is Ihota at 2.5 NM to the NW. Other ports served include Kuka (10.7 NM W), Masaki (12.1 NM ESE), Mitsuhama (12.1 NM ESE), Matsuyama (12.3 NM ESE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Oishi Lighthouse still active and maintained?+
Yes, Oishi 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 Oishi Lighthouse?+
Oishi 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 Oishi Lighthouse?+
You can track vessels near Oishi 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.