South Korea

The highest mountain in South Korea is Hallasan.

An excerpt from the article 15 facts about South Korea

It is a shield volcano with a height of 1.947,06 m above sea level. It is located on Jeju Island located south of the Korean Peninsula. Hallasan is an active volcano, although it is estimated that its last eruption took place about 5000 years ago. According to volcanological classification, however, active volcanoes are those that erupted within the last 10.000 years.