The DPRK is mostly mountainous. Mt. Paektu (2,744 m/9,003 ft), an extinct volcano with a scenic crater lake, is the highest point; it is located on the border with China and forms part of the Mach'ol Range. Other peaks of note include Mt. Kwanmo (2,541 m/8,337 ft), in the Hamgyong Range; Mt. Myohyang (1,909 m/6,263 ft), in the Myohyang Range, north of P'yongyang; and Mt. Kumgang ("Diamond Mountain," 1,638 m/5,374 ft), in the Taebaek Range in the southeast. Only about 20% of the country consists of lowlands and plains, but it is in these areas that the population is concentrated. The principal lowlands are the Unjon, P'yongyang, Chaeryong, Anju, and Yonbaek plains, extending from north to south along the west coast; and the Susong, Yongchon, Kilchu, Hamhung, and Yonghung plains, along the eastern shore.
The principal rivers are the Tumen and Yalu along the northern border of the peninsula, both of which rise in Mt. Paektu, and the Taedong, which flows past P'yongyang. The Imjin rises in the DPRK near the 38th parallel in the west and crosses into the ROK before entering the Yellow Sea. Yellow Sea tides on the west coast rise to over 9 m (30 ft) in some places; Sea of Japan / East Sea tides on the east rise to only about 1 m (3 ft).