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Moroiso Saki Lighthouse

Iso W 8s🇯🇵Tōkyō Area, JPOperational

Location & Light Range

About Moroiso Saki Lighthouse

This concrete lighthouse, built in 1944, stands 21 meters tall. Its square, hourglass-shaped tower, also 21 meters in focal height, is painted entirely white. The structure includes a gallery and an attached equipment shelter. The light emits an isophase white signal, creating a 4-second on and 4-second off cycle. Its geographic range extends to 14 nautical miles.

Light & Optic

Characteristic Signature
Iso W 8s
Flash Type
Isophase
Light Color
White
Flash Count
1 flash
Interval
8s
Raw Code
Iso
Focal Height
21m
Geographic Range
14NM

Construction & History

Year Built
1944

References & Identifiers

Admiralty No.
M6342
NGA No.
5384
ARLHS No.
JPN-1408
OpenStreetMap
View on OSM →

Tower & Structure

Tower Height
21m
Tower Shape
square
Tower Color
white
Material
concrete

Location

City
Tōkyō Area
Country
🇯🇵JP
Latitude
35.1557°
Longitude
139.6075°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Moroiso Saki Lighthouse at night?+
Moroiso Saki displays the characteristic Iso W 8s — 1 white flash 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.
Which ports and harbors does Moroiso Saki Lighthouse guide vessels into?+
Moroiso Saki Lighthouse assists vessels approaching 5 nearby ports. The closest is Maguchi at 3.5 NM to the ESE. Other ports served include Kurihama (6.8 NM NE), Hamakanaya (7.1 NM NE), Zushi (7.8 NM N), Uraga (7.8 NM NE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Moroiso Saki Lighthouse still active and maintained?+
Yes, Moroiso Saki 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 Moroiso Saki Lighthouse?+
Moroiso Saki 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 Moroiso Saki Lighthouse?+
You can track vessels near Moroiso Saki 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.