Chonji Lake, also known as Heaven Lake, is a crater lake situated on the border between China and North Korea, atop the Baekdu Mountain, which is part of the Baekdudaegan and Changbai mountain ranges. The lake is nestled within the Baekdu Mountain's caldera, which was created by volcanic activity. It is one of the deepest crater lakes in the world, with some sources claiming depths of over 200 meters. The lake itself presents an ethereal beauty, with clear blue waters often enveloped in mist, and encircled by rugged peaks. This tranquil and picturesque site is wrapped in mystery and folklore, with local legends narrating the birth of Dangun, the founder of the first Korean kingdom, near this lake. Chonji Lake is a popular destination for its stunning vistas, unique geological features, and its importance to Korean cultural identity. It also has a rich ecosystem, with a variety of plant and animal life that thrives in the area's harsh, alpine conditions.