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Katuyama Kō North Breakwater Lighthouse

Iso Green 4s🇯🇵Kyonan, JPOperational

Location & Light Range

About Katuyama Kō North Breakwater Lighthouse

A cylindrical concrete tower, painted white, stands 9 meters tall and 12 meters above sea level. This structure, featuring a gallery and a round hourglass shape, is situated at the end of the north breakwater of Katuyama Kō. It emits a green isophase light that completes a cycle every 4 seconds, visible for 11 nautical miles. The lighthouse is located near Kyonan in Chiba Prefecture, Japan, approximately 7.4 kilometers from the nearest port of Tateyama. It guides vessels into Katuyama harbor.

Why it matters: The lighthouse warns vessels of the north breakwater's end, facilitating safe entry and exit from Katuyama harbor. Its distinctive hourglass shape also makes it a recognizable feature within the port.

Light & Optic

Characteristic Signature
Iso Green 4s
Flash Type
Isophase
Light Color
Green
Interval
4s
Raw Code
Iso G 4s
Focal Height
12m
Geographic Range
11NM

Location

City
Kyonan
Country
🇯🇵Japan
Region
Chiba Prefecture
Sea Region
Located at the end of the north breakwater of Katuyama.
Latitude
35.1105°
Longitude
139.8260°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
9m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round hourglass-shaped concrete tower with gallery

References & Identifiers

Nearest Port
Tateyama(7.4 km)
ARLHS No.
JPN-246
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Frequently Asked Questions

How do mariners identify Katuyama Kō North Breakwater Lighthouse at night?+
Katuyama Kō North Breakwater displays the characteristic Iso Green 4s. 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 Katuyama Kō North Breakwater Lighthouse guide vessels into?+
Katuyama Kō North Breakwater Lighthouse assists vessels approaching 5 nearby ports. The closest is Tateyama at 6.4 NM to the S. Other ports served include Muya (6.8 NM S), Kazusaminato (6.8 NM NNE), Maguchi (7.5 NM WNW), Kurihama (8.5 NM NW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Katuyama Kō North Breakwater Lighthouse still active and maintained?+
Yes, Katuyama Kō North Breakwater 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 Katuyama Kō North Breakwater Lighthouse?+
Katuyama Kō North Breakwater 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 Katuyama Kō North Breakwater Lighthouse?+
You can track vessels near Katuyama Kō North Breakwater 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.