17' borders Minhe Hui and Tu Autonomous County in the east, the Yellow River in the south, Xunhua Salar Autonomous County and Jianzha County in Huangnan Tibetan Autonomous Prefecture across the river, Huangzhong County and Guide County in Hainan Tibetan Autonomous Prefecture in the west, and Ping 'an County and Ledu County in the north. It is 98.5 kilometers long from east to west and 48.5 kilometers wide from north to south, with a total area of 2,740 square kilometers. The total population is 230 thousand (2004). Hui nationality accounts for about 52% of the total population, and there are Tibetan, Han and Salar nationalities 12. The county people's government is located in Bayan town, 75 kilometers away from the administrative office. Postal code: 8 10900. Code: 632 127. Area code: 0972. Pinyin: Hualong Hui Autonomous County. Hualong Hui Autonomous County is located in the mountains on the north side of the Yellow River Basin, and the terrain is inclined from northwest to southeast. The Yellow River flows through the southwest and south of the county, and there are 1 1 river valleys in the territory, all of which have different water systems flowing southward into the Yellow River. It belongs to the arid area in the east of Qinghai-Tibet Plateau, with an average annual temperature of 2.2℃ and an annual precipitation of 470 mm ... [1]?