KOEN
Ulmido (울미도등대) in the middle, with the lights within 20 km, in their listed colours.
Ulmido (울미도등대) — light characteristic, height, range
One white flash every 6 seconds
Count 6 seconds.Flash white, once.Begin again.
- Characteristic
- Fl W 6s 74m 8M
- Height
- 74 m
- Nominal range
- 8 nmi = 15 km
- Type
- Landfall / major light
- Position
- 36.5945°N, 126.1988°E · West Sea coast

Lights nearby
- Geoado (거아도 태안해경 계선 등부표)One white flash every 6 seconds · 4.4 km
- Haengyeo (행여등표)2 white flashes every 10 seconds · 7.3 km
- Gomseom (곰섬항 방파제 등대)One red flash every 5 seconds · 8.0 km
- Mageompo (마검포등대)One white flash every 6 seconds · 8.1 km
- Anheung (안흥 황도등표)6 quick white flashes + one long every 15 seconds · 8.4 km
- Mageompo Hang (마검포항 방파제 등대)One red flash every 5 seconds · 8.5 km
- Mageompo Hang (마검포항 태성 등부표)4 yellow flashes every 8 seconds · 8.5 km
- Yeonpobeodyeo (연포버드여등부표)2 white flashes every 5 seconds · 8.6 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