Hua Xu is obviously from Surabaya, Jining, Shandong. Why do you say it's from Gansu?

During the Spring and Autumn Period, there was a kingdom of Hua Xu in the mountainous area of Hua Xu, which was named Hua County in the Han Dynasty. And ancient, now called Dahuanggou. Hua Xu Mountain is located at the junction of Dahuanggou Township and Xintai in the northeast of surabaya county. Nowadays, it is often called Huangshan or Huangshanzhai. The intersection of China, Huashan, Huang Zu and Huangshan formed the ancestral land of China. Surrounded by the sun of Hua Xu Mountain and the shadow of Xiao 'an Mountain, an oval basin is formed, which is five li wide from east to west and eight Li Long long from north to south. It was called "Hua Xu Pool" or "Zhu Hua" in ancient times, and the original village in the middle was Hua Xu Village, which was the former site of Huaxian County in Taishan County in Han Dynasty. 1959, Huacun Reservoir was built in this basin (Hua Xu Pool). The original Huacun was divided into four villages and moved to the shore, guarding Zhu Hua's ancestral home. Fuxi Temple is located on a hill near the pond in Hua Xu. The temple has been destroyed, leaving only. Extending eastward along Anshan is Fuxi Mountain, which contains the history of Laiwo Temple, and now only ruins are left. The monument of Fuxi Temple rebuilt by Yan Yousi in Yuan Dynasty (13 17) is still preserved on the site, and the name of the donor is mainly engraved on the monument. The trivia pool (Huacun Reservoir) and Leize Lake (Hezhuang Reservoir) formed by Huanggou River (Huazu River) and Zhushui, the two major tributaries at the source of Si Shui, are the original birthplaces of Dongyi Hao people. There is Leize Lake in the east of Linquan Town, Nanquan, which has dried up, but the locals still call it Leize Lake, which is the ancient Leize Lake. This area is the ancestral home of primitive China people and the birthplace of Chinese. Wang's textual research on Yanhuang culture: "There are Huangshan Mountain, Huangshanzhai or Mountain to the east of Surabaya today, which is a mistake of Hua Xu Mountain ... Fuxi originated from his ancestral home, and its current location and mountain name are almost Surabaya area.