Baekdu Mountain is a volcanic mountain on the border between China and North Korea. At 2,744 m, it is the highest mountain on the Korean peninsula. The area is a known habitat for tigers, bears, leopards, wolves, and wild boars. One of the highest crater lakes in the world, Heaven Lake, is at the top of the mountain. It has a circumference of 14 km, with an average depth of 213 m and maximum depth of 384 m. From mid-October to mid-June, the lake is covered with ice.