KOEN
Ongdo (옹도등대) in the middle, with the lights within 20 km, in their listed colours.
Ongdo (옹도등대) — light characteristic, height, range
One white flash every 15 seconds
Count 15 seconds.Flash white, once.Begin again.
- Characteristic
- Fl W 15s 103m 20M
- Height
- 103 m
- Nominal range
- 20 nmi = 37 km
- Type
- Landfall / major light
- Position
- 36.6474°N, 126.0086°E · West Sea coast

Lights nearby
- Gauido Hang (가의도항 방파제 등대)One green flash every 5 seconds · 5.8 km
- Gauido (가의도 태안해경 계선 등부표)One white flash every 6 seconds · 6.8 km
- Gauido (가의도 남방등표)2 white flashes every 5 seconds · 7.1 km
- Gauido (가의도 북방등표)Continuous quick white flashes · 7.2 km
- Hwachangyeo (화창여등표)One green flash every 4 seconds · 9.7 km
- Geomeunyo (검은여등표)2 white flashes every 5 seconds · 10.0 km
- Heukdo (흑도등대)2 white flashes every 6 seconds · 10 km
- Hwagiseo (화기서 북방등표)2 white flashes every 10 seconds · 10 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