- Nangan City is a small township in the Matsu Islands, which is a group of islands located off the coast of mainland China, but governed by the Republic of China (Taiwan). It is the largest and most developed city in the Matsu Islands and serves as the administrative center of the county. Nangan City is known for its historical significance, as it was once an important military outpost during the Cold War era. Today, it attracts tourists who come to explore its historical sites, enjoy the natural beauty of the island, and experience the unique culture and lifestyle of the Matsu Islands.