It’s best to go to all of them when you have time. If you can only choose 2 out of 3, then get rid of the Earth’s Core Valley because:
Suobuya Stone Forest - karst landform, the oldest stone forest in China, Daiguan Stone Forest.

Tenglong Cave - “The most beautiful place in China” is the largest cave in Asia and one of the six largest super caves in the world.

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