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Oisosaki Lighthouse

Fl (4) W 15s🇯🇵Seto Naikai Eastern - Kii Suido, JPOperational

Location & Light Range

About Oisosaki Lighthouse

This concrete lighthouse features a white, round tower that stands 36 meters high. Its focal plane reaches 38 meters above sea level. The light produces four white flashes, with each sequence repeating every 15 seconds. This navigational aid offers a geographic range of 12 nautical miles. The structure is situated within the Seto Naikai Eastern - Kii Suido region.

Light & Optic

Characteristic Signature
Fl (4) W 15s
Flash Type
Flashing
Light Color
White
Flash Count
4 flashes
Interval
15s
Raw Code
Fl.(4)W. period 15s
Focal Height
38m
Light Range
12NM (22.2 km)
Geographic Range
12NM

Location

City
Seto Naikai Eastern - Kii Suido
Country
🇯🇵JP
Latitude
34.1800°
Longitude
134.6415°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
36m
Tower Shape
round
Tower Color
white
Material
concrete

Structure: White round concrete tower; 36

References & Identifiers

Admiralty No.
M5551.8
NGA No.
7144
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Frequently Asked Questions

How far offshore can Oisosaki Lighthouse be seen?+
With a focal height of 38 meters and a nominal range of 12 nautical miles (approximately 22.2 km), Oisosaki is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. This range makes it a significant coastal navigation aid for vessels transiting the area.
How do mariners identify Oisosaki Lighthouse at night?+
Oisosaki displays the characteristic Fl (4) W 15s — 4 white flashes every 15 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 Oisosaki Lighthouse guide vessels into?+
Oisosaki Lighthouse assists vessels approaching 5 nearby ports. The closest is Naruto at 1.4 NM to the WNW. Other ports served include Awazu (2.5 NM SW), Imagire (4.5 NM SSW), Orino (8.2 NM WNW), Tokushima (8.3 NM SSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Oisosaki Lighthouse still active and maintained?+
Yes, Oisosaki 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 Oisosaki Lighthouse?+
Oisosaki 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 Oisosaki Lighthouse?+
You can track vessels near Oisosaki 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.