Why are ancient tombs in Henan?

Henan has been the central area of China since ancient times and the capital of many dynasties, so there are many powerful people. Many celebrities are buried in Henan, and some places have naturally become a treasure trove of geomantic omen. Others are either buried in ancestral graves or in the tombs of revolutionary martyrs, just as many people desperately want to be buried in Babaoshan or other revolutionary martyrs' tombs now. For example, Fan Zhongyan's ancestors were buried in Gusu, and later he became a dignitary and was buried in Yichuan, Henan.