I went to the source and saw the map. https://www.cambridge.org/core/journals/antiquity/article/radiocarbondating-an-early-minting-site-the-emergence-of-standar

I went to the source and saw the map. https://www.cambridge.org/core/journals/antiquity/article/radiocarbondating-an-early-minting-site-the-emergence-of-standardised-coinage-in-china/178ECC2B245A017BF684BE1EFC732BD1 https://www.cambridge.org/core/journals/antiquity/article/ra... And from the map. It looks like it's around this part of Yellow River. (Guanzhuang, Xingyang, Zhengzhou, Henan, China 34.69942093691378, 113.36167182390584)