We were at sea level yesterday but above the snow line today. This is Mulchat oreum, reasonably high on the eastern slopes of Mt Halla. The top of the oreum was off limits today (for conservation reasons?) so we didn’t get to look into the crater. Instead, I’ll just have to imagine it from the description on the notice at the highest point on the path we walked:
“There’s a funnel figured crater lake with watered, year round and it’s one of the very precious crater lake in Jeju island with 1km out-diameter.”
Notes from a Korean island 