Mount Kumgang () or the Kumgang Mountains is a mountain massif, with a peak, in Kangwon-do, North Korea. It is located on the east coast of the country, in Mount Kumgang Tourist Region, formerly part of Kangwŏn Province, and is part of the Taebaek mountain range which runs along the east of the Korean Peninsula. The mountain is about from the South Korean city of Sokcho in Gangwon-do.
Mount Kumgang has been known for its scenic beauty since ancient times and is the subject of many different works of art. Including its spring name, Kŭmgangsan (, kɯmɡaŋshan), it has many different names for each season, but it is most widely known today in the Korean language as Kŭmgangsan. In summer it is called Pongraesan (봉래산, : the place where a Spirit dwells); in autumn, Phung'aksan (풍악산, : hill of colored leaves, or : great mountain of colored leaves); in winter, Kaegolsan (개골산, : stone bone mountain).
The creation of Mt. Kŭmgang is closely related to the unique climate and distinctive geological activity of the area. Mt. Kŭmgang is a region where rain and snow fall relatively heavily, and the climate varies depending on altitude and even east-west location. The Kŭmgang geological layer is composed of several types of rocks from ancient geological periods. The most widely distributed rocks are granites of two types (mica mixed and stained), with granite-gneissic fertilization zones being formed in some areas. The rocks are transversely oriented and form a joint in various directions, forming unusual terrains and strange rocks, which have been formed as a result of erosion for a long period of crustal activity and weathering, from 10 million years to the present.
Kŭmgang Mountain ranges from Tongcheon-gun, Gangwon-do in the Democratic People's Republic of Korea, to Inje-gun, Gangwon-do in the Republic of Korea. The area is up to 40 km long east–west, 60 km north–south, with a total size of 530 km2 to the back of Baekdudaegan. It is divided between the "Inner Kumgang" in the west and the "Outer Kumgang" in the east.