Asan is a city in South Chungcheong Province, South Korea. It borders the Seoul Capital Area to the north. Asan has a population of approximately 300,000.

South Chungcheong Province, also known as Chungnam, is a province of South Korea in the Hoseo region in the southwest of the Korean Peninsula. South Chungcheong borders the provinces of Gyeonggi to the north, North Chungcheong, Sejong Special Self-governing City, and Daejeon Metropolitan City to the east, and North Jeolla to the south.