Sangumburi Crater differs from the 360 or more parasitic cones of Jeju in that it was not formed when the materials ejected from the eruption stacked. Instead, it is a maar-type parasitic cone that was formed as a crater with a hole in it when many materials were ejected. The inner area is 300,000㎡, while the interior bottom circumference is 756m, and the exterior circumference is 2,070m. Nearly vertical, the crater is approximately 130m tall, making it slightly larger and deeper than Hallasan Mountain.