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Ishigaki Kō Lighthouse

Fl (2) Green 8s🇯🇵Ishigaki, JPOperational

Location & Light Range

About Ishigaki Kō Lighthouse

Also known as: Ishigaki Kō (West Outer Breakwater)

Constructed in 1986, this lighthouse is situated on the northwest extremity of an outer breakwater to the southwest of Ishigaki Shima. The structure is a round, cylindrical concrete tower, 16 meters tall, topped with a lantern and gallery. The light source is 17 meters above sea level. It displays a green light with a characteristic of a single flash every 8 seconds, visible for 12.4 nautical miles. Located 0.3 kilometers from Ishigaki Port, the lighthouse is currently active.

Why it matters: This navigation aid marks the entrance to Ishigaki Port, indicating safe passage for ships. It serves as a reference point to avoid underwater breakwater sections and supports ongoing maritime activity for the region's commerce and transport.

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
17m
Geographic Range
12.4NM

Construction & History

Year Built
1986

References & Identifiers

Nearest Port
Ishigaki(0.3 km)
ARLHS No.
JPN-179

Tower & Structure

Tower Height
16m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round cylindrical concrete tower with lantern and gallery

Location

City
Ishigaki
Country
🇯🇵Japan
Region
Okinawa Prefecture
Sea Region
northwest end of the detached outer breakwater of Ishigaki, on the southwest side of Ishigaki Shima
Latitude
24.3351°
Longitude
124.1364°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Ishigaki Kō Lighthouse at night?+
Ishigaki Kō 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 Ishigaki Kō Lighthouse guide vessels into?+
Ishigaki Kō Lighthouse assists vessels approaching 4 nearby ports. The closest is Ishigaki at 1.1 NM to the ENE. Other ports served include Kohama (8.4 NM W), Funaura (18.3 NM WNW), Hatoma (21.7 NM WNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Ishigaki Kō Lighthouse still active and maintained?+
Yes, Ishigaki 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.
How can I track vessels near Ishigaki Kō Lighthouse?+
You can track vessels near Ishigaki 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.