What is the major mountain range in South Korea?

Which mountain range runs through the state of Montana in the United States? Which mountain range runs through the country of Romania? Which mountain range runs through the country of Morocco? What is the world's longest continental mountain range? Which mountain range runs along the border between Poland and Slovakia? Which mountain range stretches across northern Turkey? What is the longest mountain range in Africa? Which mountain range in North America stretches from British Columbia, Canada, to New Mexico, USA?