It's false the neolithic societies known as Yangshuo and Longshan were discovered far to the south of the Yangtze river near modern Vietnam.
The Yangshao culture was concentrated in the middle reaches of the Yellow River. A village community growing millet was found there. Longshan was further east in the middle and lower reaches of the Yellow River.
The Yangshuo and Longshan culture (also known as Yongsan) flourished in the 3rd millennium BC. It was part of northeastern China in the late Neolithic period and was an important link in the development of Chinese civilization from independent Neolithic communities to the first dynastic states.
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