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Aio Kō Lighthouse

Iso R 4s🇯🇵Yamaguchi, JPOperational

Location & Light Range

About Aio Kō Lighthouse

Aio Kō Lighthouse is a maritime navigation aid located in Yamaguchi, JP. It is currently operational and active, providing guidance to vessels navigating the surrounding waters. The light sits at a focal height of 12 meters above mean sea level.

Light characteristic: The identifying signal of this lighthouse is Iso R 4s. This means the light produces 1 flash every 4 seconds. Mariners use this distinctive pattern to positively identify the light and distinguish it from other aids to navigation in the area. The light color is red, which may indicate a specific sector or warning zone.

Position: Aio Kō Lighthouse is positioned at 34.0089°N, 131.4273°E, near Yamaguchi in JP.

Geographic context: Aio Kō Lighthouse is situated on the Sea of Japan, within the Japan / Korea shipping lane — a busy shipping corridor linking the major ports of Japan and South Korea. The location falls within the subtropical climate zone with mild winters and warm summers.

Nearby lighthouses in JP: Other lighthouses in the region include Abashiri East Breakwater, Abashiri Island Breakwater North End, Abashiri North Breakwater, Abashiri South Breakwater East End, Abuka Kō. View all on the Lighthouses Directory.

Nearby Ports

Aio

JPAII

0.3 NMW

Hofu

JPHOF

3.2 NMENE

Maruo

JPMRU

4.4 NMWSW

Nakanoseki

JPNAN

6.3 NME

Mitajiri

JPMJR

8.5 NME

Flash Characteristics

Characteristic Signature
Iso R 4s
Flash Type
Isophase
Light Color
Red
Flash Count
1 flash
Interval
4s

Physical Specifications

Focal Height
12m
Light Range
Not available
Status
ACTIVE
City
Yamaguchi
Country
🇯🇵JP
Latitude
34.0089°
Longitude
131.4273°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Aio Kō Lighthouse at night?+
Aio Kō displays the characteristic Iso R 4s — 1 red flash every 4 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 red color may indicate a specific sector or warning zone.
Which ports and harbors does Aio Kō Lighthouse guide vessels into?+
Aio Kō Lighthouse assists vessels approaching 5 nearby ports. The closest is Aio at 0.3 NM to the W. Other ports served include Hofu (3.2 NM ENE), Maruo (4.4 NM WSW), Nakanoseki (6.3 NM E), Mitajiri (8.5 NM E). Mariners should consult the relevant chart for full approach and pilotage information.
Is Aio Kō Lighthouse still active and maintained?+
Yes, Aio 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 Aio Kō Lighthouse?+
Aio 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 Aio Kō Lighthouse?+
You can track vessels near Aio 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.