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Mano Wan Breakwater Lighthouse

Fl (2) Green 6s🇯🇵Sado, JPOperational

Location & Light Range

About Mano Wan Breakwater Lighthouse

This 9.5-meter white concrete post light is attached to a 1-story concrete equipment shelter. It stands at the east end of a detached breakwater that shelters ports on the west side of Mano Bay, an embayment on the south side of Sado Shima. The light emits a green flash every six seconds. The site is open to the public, but the tower is closed. It serves vessels navigating the protected waters of the bay, near Futami, Niigata.

Why it matters: The light provides critical guidance for vessels navigating the sheltered waters behind the long detached breakwater, marking its eastern end and ensuring safe access to the bay's harbors.

Light & Optic

Characteristic Signature
Fl (2) Green 6s
Flash Type
Flashing
Light Color
Green
Flash Count
2 flashes
Interval
6s
Raw Code
Fl G 6s
Focal Height
10m
Geographic Range
10.4NM

Location

City
Sado
Country
🇯🇵Japan
Region
Niigata Prefecture
Sea Region
Mano Bay (Mano Wan), an embayment on the south side of Sado Shima, where it marks the east end of a long detached breakwater sheltering ports on the west side of the bay.
Latitude
37.9767°
Longitude
138.2659°

References & Identifiers

Nearest Port
Futami, Niigata(0.2 km)
Admiralty No.
M7103.5
NGA No.
3224
ARLHS No.
JPN-1266

Tower & Structure

Tower Height
9.5m
Tower Shape
post
Tower Color
white
Material
concrete

Structure: A 9.5m white concrete post attached to a square 1-story concrete equipment shelter.

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Mano Wan Breakwater Lighthouse at night?+
Mano Wan Breakwater displays the characteristic Fl (2) Green 6s — 2 green flashes every 6 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 green color may indicate a specific sector or warning zone.
Which ports and harbors does Mano Wan Breakwater Lighthouse guide vessels into?+
Mano Wan Breakwater Lighthouse assists vessels approaching 5 nearby ports. The closest is Futami, Niigata at 0.2 NM to the WNW. Other ports served include Hamochi (9.4 NM SSE), Akadomari (9.6 NM SE), Ogi, Niigata (9.8 NM S), Ryotsu (10.1 NM NE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Mano Wan Breakwater Lighthouse still active and maintained?+
Yes, Mano Wan 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 Mano Wan Breakwater Lighthouse?+
Mano Wan 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 Mano Wan Breakwater Lighthouse?+
You can track vessels near Mano Wan 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.