Yanmenguan怀仁县is located in Shanxi Province, the Datong Basin, central, the county has a total area 1232 square kilometers, accounting for 0.78 percent of the province's area. Pingchuan which accounted for 70%, 24% mountainous, hilly slopes of 6%. Territory is the north temperate zone continental monsoon climate, four seasons, the annual average temperature 7.3 º C, average annual sunshine hours 2800 hours, with an average annual rainfall of 380 mm. Frost-free period around 150 days. The county a total of 10 townships, 163 villages, total population of 286,000, of which agricultural population of 172,000 people. South of historic city of Datong 37 kilometers, north of new energy and heavy chemical industry base in Shuozhou City 96 kilometers, has a link with the new moon, to communicate something unique advantage, whether it is the merchants南来北往or watch Yingxian Wooden Tower, hengshan悬空寺, Yungang Grottoes and other tourist attractions, are passing through the county. Its advantageous geographical location, on the economic development of Huairen has had a positive role in promoting, with the reform and development of the further development of market economy, the effect will be even more remarkable.答案补充 :怀仁县地处山西省雁门关外、大同盆地中部,全县国土总面积1232平方公里,占全省面积的0.78%。其中平川占70%,山区占24%,丘陵山坡占6%。境内属北温带大陆性季风气候,四季分明,年平均气温7.3ºC,年均日照时数2800小时,年均降雨量380毫米。无霜期150天左右。全县共10个乡镇,163个村,总人口28.6万人,其中农业人口17.2万人。北距历史名城大同37公里,南距新型能源重化工基地朔州市96公里,有着联结同朔,沟通东西的得天独厚的区位优势,不论是南来北往的客商,还是观赏应县木塔,恒山悬空寺、云岗石窟等名胜古迹的游客,都途经该县。优越的地理位置,对怀仁的经济发展曾产生了积极的推动作用,随着改革开发的市场经济的进一步发展,这个效应将会更加显著。