Dongguan and Asan City in South Korea formally became sister cities in September 2012.

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

Asan is known for its hot springs and is a city of spas. 

The city of Asan shares a station for the KTX high speed trains with the neighbouring city of Cheonan called Cheonan-Asan Station. It takes about 30 minutes to travel from Asan to Seoul by the KTX train. It can be reached within 2 hours from Incheon International Airport by car. Seoul Metropolitan Subway extended one of its lines to service Asan on December 15, 2008. Two major highways, the Seoul-Busan and West Coast expressways, also pass through Asan city.

Companies like Hyundai Motor, Samsung LCD, and Samsung Electronic have factories in Asan. A total of 14 industrial complexes are currently occupied by auto parts, electronic parts and other factories. 

The Port of Pyeongtaek, closest to the east China coast among Korean ports, is nearby.