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Okino Se Lighthouse

Fl (2) White 5s🇯🇵Imabari, JPOperational

Location & Light Range

About Okino Se Lighthouse

Okino Se lighthouse, a concrete cylindrical tower standing 13 meters tall, was first lit in 1982. Its exterior is painted black with a single red horizontal band. The lighthouse features a white light that flashes once every 5 seconds. Its focal height reaches 15 meters above the water. The structure has a round, vase-like shape and is situated on a reef approximately 10 kilometers east of the Kuroshima Strait, off the southeast coast of Ōshima. While the site is accessible by boat, the tower itself is closed to the public.

Why it matters: This lighthouse is important for safe passage through the waters east of the Kuroshima Strait, warning mariners of the submerged reef. Its light characteristic helps vessels navigate coastal shipping lanes around Ōshima.

Light & Optic

Characteristic Signature
Fl (2) White 5s
Flash Type
Flashing
Light Color
White
Flash Count
2 flashes
Interval
5s
Raw Code
Fl W 5s
Focal Height
15m
Geographic Range
11.9NM

Construction & History

Year Built
1982

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
13m
Tower Shape
cylindrical
Tower Color
black with one red horizontal band
Material
concrete

Structure: round vase-shaped concrete tower, painted black with one red horizontal band

Location

City
Imabari
Country
🇯🇵Japan
Region
Ehime Prefecture
Sea Region
on a reef off the southeast coast of Ōshima, about 10 km (6 mi) east of the Kuroshima Strait
Latitude
34.1052°
Longitude
133.1059°

References & Identifiers

Nearest Port
Yoshiumi(4.7 km)
Admiralty No.
M5470.3
NGA No.
8696
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Frequently Asked Questions

How do mariners identify Okino Se Lighthouse at night?+
Okino Se displays the characteristic Fl (2) White 5s — 2 white flashes every 5 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 white color may indicate a specific sector or warning zone.
Which ports and harbors does Okino Se Lighthouse guide vessels into?+
Okino Se Lighthouse assists vessels approaching 5 nearby ports. The closest is Yoshiumi at 4.9 NM to the NW. Other ports served include Imabari (5.2 NM WSW), Hakatashima (6 NM N), Hashihama (6.7 NM W), Namikata (7.6 NM W). Mariners should consult the relevant chart for full approach and pilotage information.
Is Okino Se Lighthouse still active and maintained?+
Yes, Okino Se 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 Okino Se Lighthouse?+
Okino Se 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 Okino Se Lighthouse?+
You can track vessels near Okino Se 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.