Search Googlemaps under "Lieyu Township" (which is in Taiwan) and see how close it is to Xiamen (which is in China). Then, go to Wikipedia and edit the entry that claims that gap is 2101 km, and write in 4 km instead.
Also please add DPRK (Democratic People's Republic of Korea (North Korea)) and ROC (Republic of China (Taiwan)) since they are accepted by other quizzes.