Heishui County, affiliated to Aba Tibetan and Qiang Autonomous Prefecture in Sichuan Province, is located in the eastern part of the Qinghai-Tibet Plateau, in the middle of Aba Tibetan and Qiang Autonomous Prefecture, bordering Songpan in the north, Hongyuan and Maoxian in the east and west, and Lixian and Malkang in the south and southwest. It is 284 kilometers away from the provincial capital Chengdu, the county seat is 2350 meters above sea level, and the county area is 4356 square kilometers [14]. The name of the black water reservoir is "Cuoqu", which means "water of pig iron". The Heishui River is a tributary of the upper reaches of the Minjiang River. There are 99 Xiaoheishui Rivers, Maurgai Rivers and brooks. [1] According to the seventh census data, as of 0:00 on November 1, 2020, the resident population of Heishui County was 44,564. [12]