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Naga Se Lighthouse

Fl (2) Green 5s🇯🇵Amakusa, JPOperational

Location & Light Range

About Naga Se Lighthouse

Naga Se lighthouse is a white, cylindrical concrete tower standing 7.5 meters tall, built in 1977. It is mounted on a round concrete pier and features a double gallery. The light is green and emits a single flash every 5 seconds. This structure rises 10 meters above sea level and has a geographic range of 10.4 nautical miles. It is located off Kyunan harbor, marking the entrance to Miyanokawachi Bay in Amakusa, Kumamoto Prefecture. The site is open to the public, but the tower itself is closed.

Why it matters: Naga Se is indispensable for safe navigation into Miyanokawachi Bay and Kyunan harbor, guiding local fishing vessels and other maritime traffic through the entrance.

Light & Optic

Characteristic Signature
Fl (2) Green 5s
Flash Type
Flashing
Light Color
Green
Flash Count
2 flashes
Interval
5s
Raw Code
Fl G 5s
Focal Height
10m
Geographic Range
10.4NM

Construction & History

Year Built
1977

Visiting

Open to public
Site open, tower closed

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
7.5m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round concrete tower with double gallery, mounted on a round concrete pier

Location

City
Amakusa
Country
🇯🇵Japan
Region
Kumamoto Prefecture
Sea Region
off Kyunan harbor, marking the entrance to Miyanokawachi Bay
Latitude
32.3134°
Longitude
130.1679°

References & Identifiers

Nearest Port
Shishijima(3.2 km)
Admiralty No.
M5129.3
NGA No.
11396
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Frequently Asked Questions

How do mariners identify Naga Se Lighthouse at night?+
Naga Se displays the characteristic Fl (2) Green 5s — 2 green flashes every 5 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 Naga Se Lighthouse guide vessels into?+
Naga Se Lighthouse assists vessels approaching 5 nearby ports. The closest is Kamihira at 2.4 NM to the SW. Other ports served include Katasoba (3.2 NM SE), Kuzu (3.5 NM SSE), Amatsuke (4.9 NM NE), Fukami (5.1 NM SW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Naga Se Lighthouse still active and maintained?+
Yes, Naga Se 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 Naga Se Lighthouse?+
Naga Se 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 Naga Se Lighthouse?+
You can track vessels near Naga Se 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.