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Ōiso Kō Lighthouse

F Green 6s🇯🇵Oiso, JPOperational

Location & Light Range

About Ōiso Kō Lighthouse

Ōiso Kō lighthouse stands at the end of the south breakwater in Oiso, Japan. Constructed from concrete in 2011, this square tower is 10 meters tall and has a focal height of 14 meters. It features a distinctive design that is wider at the top than at the bottom and is painted white with the town's name in large blue Latin letters on its sides. The lighthouse emits a green light, with a single flash every six seconds, providing a geographic range of 11.6 nautical miles. The site is open to the public, though the tower itself is closed to ensure continued operation.

Why it matters: This lighthouse marks the extended main breakwater, offering safe navigation into Ōiso's harbor. Its unique appearance also serves as a visual identifier for mariners.

Light & Optic

Characteristic Signature
F Green 6s
Flash Type
Fixed
Light Color
Green
Interval
6s
Raw Code
F G (Fl) 6s
Focal Height
14m
Geographic Range
11.6NM

Construction & History

Year Built
2011

Significant events: Breakwater extended, new lighthouse built to replace old one

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
10m
Tower Shape
square
Tower Color
white with the name of the town in large blue Latin letters on the sides
Material
concrete

Structure: square concrete tower with gallery; the tower is wider at the top than at the bottom

Location

City
Oiso
Country
🇯🇵Japan
Region
Kanagawa Prefecture
Sea Region
end of the south (main) breakwater at Ōiso
Latitude
35.3049°
Longitude
139.3205°

References & Identifiers

Nearest Port
Oiso(0.1 km)
ARLHS No.
JPN-1412
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Frequently Asked Questions

How do mariners identify Ōiso Kō Lighthouse at night?+
Ōiso Kō displays the characteristic F Green 6s. 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 Ōiso Kō Lighthouse guide vessels into?+
Ōiso Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Oiso at 0.1 NM to the NW. Other ports served include Hiratsuka (2.2 NM E), Chigasaki (3.8 NM E), Shonan (8.2 NM E), Manazuru (12.6 NM SW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ōiso Kō Lighthouse still active and maintained?+
Yes, Ōiso Kō 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 Ōiso Kō Lighthouse?+
Ōiso Kō 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 Ōiso Kō Lighthouse?+
You can track vessels near Ōiso Kō 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.