张家口市位于河北省的西北部，全市４个区和１３个县中的多数海拔高，气温低，降雨量少，森林覆盖率低，风沙危害严重。特别是位于坝上的几个县，生态环境恶劣，是有名的贫困地区。该市是首都北京的西北门户，又是华北地区３条主要河流（滦河、潮白河和永定河）的源头，因... Zhangjiakou City is located in the northwestern part of Hebei Province. Most of the 4 districts and 13 counties in the city are at high altitude with low temperatures, low rainfall, low forest coverage and serious sand and wind damage. Especially in the dam on several counties, poor ecological environment, is well-known poor areas. The city is the capital of the northwestern gateway to Beijing and the source of three major rivers in North China (Luanhe, Chaobaihe and Yongding Rivers).