"China's space station, Tiangong, orbits Earth at an altitude between 217 and 280 miles (340 to 450 kilometers), approximately the same orbital height as the International Space Station (ISS). 

The Chinese Manned Space Agency (CMSA) built Tiangong — which means "Heavenly Palace" — in low Earth orbit, launching each of the three modules that make up the station between 2021 and 2022. The CMSA launched Tianhe, the first station module, on April 28, 2021, the second module Wentian on July 24, 2022, and the third module Mengtian on Oct. 31, 2022. 

The first crew to visit China's space station, Shenzhou 12, arrived on June 16, 2021, when only the core module Tianhe was in orbit. The taikonauts — Chinese astronauts — spent 90 days aboard Tianhe, approximately three times longer than any previous Chinese crewed spaceflight."

https://www.space.com/tiangong-space-station