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Kannonsaki Lighthouse

Fl (2) W 15s🇯🇵Honshu-South Coast-Tokyo Wan, JPOperational

Location & Light Range

About Kannonsaki Lighthouse

Kannonsaki Lighthouse was built and first lit in 1869. Its tower stands 19 meters tall, with the light positioned 56 meters above sea level. The lighthouse emits two white flashes every 15 seconds, providing a geographic range of 19 nautical miles. It is located on the Miura Peninsula within Yokosuka, Kanagawa Prefecture on Honshu Island.

Why it matters: This lighthouse marks the entrance to Tokyo Bay from the south.

Background
Kannonzaki Lighthouse (観音埼灯台) is a lighthouse on Cape Kannon, on Miura Peninsula, in Yokosuka, Kanagawa, Japan.

Light & Optic

Characteristic Signature
Fl (2) W 15s
Flash Type
Flashing
Light Color
White
Flash Count
2 flashes
Interval
15s
Raw Code
Fl.(2)W. period 15s
Focal Height
56m
Light Range
19NM (35.2 km)
Geographic Range
19NM

Construction & History

Year Built
1869

References & Identifiers

Admiralty No.
M6360
NGA No.
5076
Wikipedia
Read on Wikipedia →
Wikidata
Q6364109 →

Tower & Structure

Tower Height
19m

Location

City
Honshu-South Coast-Tokyo Wan
Country
🇯🇵JP
Latitude
35.2562°
Longitude
139.7454°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How far offshore can Kannonsaki Lighthouse be seen?+
With a focal height of 56 meters and a nominal range of 19 nautical miles (approximately 35.2 km), Kannonsaki is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. Lights of this range are typically used as landfall lights by vessels approaching from the open sea.
How do mariners identify Kannonsaki Lighthouse at night?+
Kannonsaki displays the characteristic Fl (2) W 15s — 2 white flashes every 15 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.
Which ports and harbors does Kannonsaki Lighthouse guide vessels into?+
Kannonsaki Lighthouse assists vessels approaching 5 nearby ports. The closest is Uraga at 1.3 NM to the SW. Other ports served include Hamakanaya (2 NM SW), Kurihama (2.3 NM SSW), Yokosuka (3.5 NM NW), Hayama (4.2 NM WNW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Kannonsaki Lighthouse still active and maintained?+
Yes, Kannonsaki 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 Kannonsaki Lighthouse?+
Kannonsaki 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 Kannonsaki Lighthouse?+
You can track vessels near Kannonsaki 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.