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Hannan Ko Lighthouse

Fl (2) R 5s🇯🇵Seto Naikai Eastern, JPInactive

Location & Light Range

About Hannan Ko Lighthouse

Hannan Ko is a round concrete tower standing 28 meters high. The focal height of its light is 13 meters. Its light showed two red flashes every 5 seconds. This former navigational aid had a geographic range of 5 nautical miles. The lighthouse is located in Seto Naikai Eastern.

Light & Optic

Characteristic Signature
Fl (2) R 5s
Flash Type
Flashing
Light Color
Red
Flash Count
2 flashes
Interval
5s
Raw Code
Fl.(2)R. period 5s
Focal Height
13m
Light Range
5NM (9.3 km)
Geographic Range
5NM

Location

City
Seto Naikai Eastern
Country
🇯🇵JP
Latitude
34.4231°
Longitude
135.3103°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
28m
Tower Shape
round
Material
concrete

Structure: Round concrete tower; 28. JAPAN-SETO NAIKAI-EASTERN PART (I) 80 (1)

References & Identifiers

Admiralty No.
M5957.52
NGA No.
7235
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Frequently Asked Questions

How far offshore can Hannan Ko Lighthouse be seen?+
With a focal height of 13 meters and a nominal range of 5 nautical miles (approximately 9.3 km), Hannan Ko is visible from well offshore under standard atmospheric conditions. Actual visibility depends on observer height, weather, and sea state. As a shorter-range light, it primarily serves nearshore and coastal traffic.
How do mariners identify Hannan Ko Lighthouse at night?+
Hannan Ko displays the characteristic Fl (2) R 5s — 2 red 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 red color may indicate a specific sector or warning zone.
Which ports and harbors does Hannan Ko Lighthouse guide vessels into?+
Hannan Ko Lighthouse assists vessels approaching 5 nearby ports. The closest is KAIZUKA at 2.9 NM to the NE. Other ports served include Sensyu (3 NM WNW), Hannan (3.3 NM NE), Tannowa (8 NM SW), Sakai (8.3 NM NE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Hannan Ko Lighthouse still active and maintained?+
Hannan Ko Lighthouse is currently listed as inactive. It may have been decommissioned, replaced by a different navigation aid, or temporarily taken out of service. Mariners should check the latest Notices to Mariners for current status.
What shipping routes pass near Hannan Ko Lighthouse?+
Hannan Ko 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 Hannan Ko Lighthouse?+
You can track vessels near Hannan Ko 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.