The Taiwan region's participation in the activities of international organizations must follow the one-China principle, Chinese Foreign Ministry spokesperson Wang Wenbin said on Monday.

He made the remarks at a regular press conference when commenting on the designation issue of the Taiwan region in the Global Covenant of Mayors for Climate and Energy, an international network of mayors dedicated to mitigating climate change.

There is only one China in the world and the Taiwan region is an inalienable part of China's territory, Wang said, stressing that the Taiwan region should be listed under the country category of "China."