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Daini Kaiho Lighthouse

Fl White/Red 5s🇯🇵Futtsu, JPOperational

Location & Light Range

About Daini Kaiho Lighthouse

The Daini Kaiho lighthouse is a 12-meter cylindrical concrete tower topped with a lantern and gallery. It stands on an artificial island near the main Tōkyō Bay shipping channel, about 8 kilometers northeast of Yokosuka. This location marks the entrance to Tōkyō Bay, approximately 4 kilometers west of a promontory on the eastern Chiba Prefecture coast. The lighthouse emits a directional white or red flash every five seconds. Originally, the island served as one of three defensive forts built in the early 1800s. The structure has a focal height of 20 meters and a geographic range of 13.2 nautical miles.

Why it matters: This lighthouse is essential for guiding vessels through the main channel of Tōkyō Bay, a critical maritime gateway. Its placement on a former defensive fort island highlights its enduring strategic significance.

Light & Optic

Characteristic Signature
Fl White/Red 5s
Flash Type
Flashing
Light Color
White/Red
Interval
5s
Raw Code
Fl WR 5s
Focal Height
20m
Light Range
13NM (24.1 km)
Geographic Range
13.2NM

Construction & History

Significant events: Built as one of three defensive forts in the early 1800s

References & Identifiers

Nearest Port
Yokosuka(3.0 km)
Admiralty No.
M6368
ARLHS No.
JPN052
Wikidata
Q126735480 →
OpenStreetMap
View on OSM →

Tower & Structure

Tower Height
12m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round cylindrical concrete tower with lantern and gallery

Location

City
Futtsu
Country
🇯🇵Japan
Region
Chiba Prefecture
Sea Region
Located on an artificial island near the main channel of Tōkyō Bay, approximately 8 km northeast of Yokosuka and 4 km west of a promontory on the eastern Chiba Prefecture coast, marking the entrance to Tōkyō Bay.
Latitude
35.3117°
Longitude
139.7413°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How far offshore can Daini Kaiho Lighthouse be seen?+
With a focal height of 20 meters and a nominal range of 13 nautical miles (approximately 24.1 km), Daini Kaiho 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 Daini Kaiho Lighthouse at night?+
Daini Kaiho displays the characteristic Fl White/Red 5s. 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 white/red color may indicate a specific sector or warning zone.
Which ports and harbors does Daini Kaiho Lighthouse guide vessels into?+
Daini Kaiho Lighthouse assists vessels approaching 5 nearby ports. The closest is Yokosuka at 2.9 NM to the WSW. Other ports served include Hayama (4 NM WSW), Uraga (4.3 NM S), Hamakanaya (4.9 NM SSW), Kurihama (5.4 NM S). Mariners should consult the relevant chart for full approach and pilotage information.
Is Daini Kaiho Lighthouse still active and maintained?+
Yes, Daini Kaiho 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 Daini Kaiho Lighthouse?+
Daini Kaiho 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 Daini Kaiho Lighthouse?+
You can track vessels near Daini Kaiho 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.