North Korea is generally considered to be more mountainous than South Korea.
North Korea has a rugged and mountainous terrain that covers about 80% of its land area, with the highest peak being Mount Paektu, which stands at 2,750 meters (9,020 feet) above sea level. The country is also home to a number of other significant mountain ranges, including the Hamgyong Mountains, the Rangrim Mountains, and the Kangnam Mountains.
In contrast, South Korea has a more varied landscape that includes mountains, hills, plains, and coastal areas. While it does have some significant mountain ranges, such as the Taebaek Mountains and the Sobaek Mountains, they are generally not as extensive or rugged as those found in North Korea.