The city in question is Yanjin, located in a narrow valley between two mountains in Yunnan province, China, where its width reaches 30 meters. "Yanjin is situated between two extremely steep mountains, and its width at its narrowest point is only 30 meters. Even at its widest point, its width only reaches 300 meters," the article adds. This city is unusual due to its interesting vertical architecture and tall, narrow buildings constructed for flood protection. "To make the most efficient use of the available space, the city's creators decided to build everything vertically. The buildings are placed on high supports to save space while simultaneously protecting them from floods. Therefore, everything looks compact," notes Newsweek.