Archaeologists find network of ancient tunnels at Houchengzui

Archaeologists excavating at Houchengzui in the Inner Mongolia Autonomous Region have uncovered a network of ancient tunnels.

Houchengzui, also known as Houchengzui Stone City, is an archaeological site located on the northern shore of the Hun River within Qingshuihe County, situated in the Mongolia Autonomous Region.

Previous excavations have dated the city to around 4,300 to 4,500 years ago during the Longshan period, which saw the emergence of late Neolithic societies such as the Black Pottery or Longshan culture.

Encompassing approximately 341 acres in an oval layout, Houchengzui…