KOEN
Sejondo (세존도등대) in the middle, with the lights within 20 km, in their listed colours.
Sejondo (세존도등대) — light characteristic, height, range
2 white flashes every 6 seconds
Count 6 seconds.Flash white, 2 times.Begin again.
- Characteristic
- Fl(2) W 6s 23m 11M
- Height
- 23 m
- Nominal range
- 11 nmi = 20 km
- Type
- Landfall / major light
- Position
- 34.4991°N, 128.0839°E · South Sea coast

Lights nearby
- Gudolseo (구돌서등대)One white flash every 6 seconds · 14 km
- Yeosuhaeman Jungang A (여수해만 중앙 A호 유도 등부표)One long white flash every 10 seconds · 17 km
- Baekseo (백서등대)One white flash every 6 seconds · 17 km
- Tongyeong (통영 남방 기상 등부표)5 yellow flashes every 20 seconds · 18 km
- Jakdo (작도등대)One white flash every 10 seconds · 19 km
- Yokjido (욕지도등대)One white flash every 6 seconds · 19 km
- Heukcho (흑초등표)2 white flashes every 5 seconds · 20 km
- Godo (고도등표)6 quick white flashes + one long every 15 seconds · 20 km
Not for navigation. Use official NOAA charts and USCG Local Notices to Mariners.
Real periods; the phase is reconstructed from a fixed clock (real lights don't keep time with each other).
Sources: KHOA light list (국립해양조사원 등대표) (opens in a new tab) · Checked