Eastern Jeju island, Jeju Province
The Sangumburi crater and the viewpoint from which you get the best view into the second largest of the 360 “parasitic cones” (secondary volcanoes) found on Jeju-do, about 650 metres wide, 100 metres deep, and 2,070 metres in circumference.
Photo by Ludo Kuipers, Wed Jun 25, 2014