湘西北山区处于109°10′—111°30′E,27°40′—30°10′N之间,包括18个县市。全区土地面积42600平方公里,约占湖南省土地总面的20％。本区自然环境有如下特征。 1.山丘广布,岭高坡陡 本区有武陵、雪峰两山脉纵贯,地势较高,山地丘陵面积约占土地总面积的90％,山坡陡峭,高差较大。沅江、澧水穿山而过,形成深切峡谷,平原低地甚少。 The mountainous area in northwestern Hunan lies between 109 ° 10’-111 ° 30’E and 27 ° 40’-30 ° 10’N, including 18 counties and cities. The land area of ​​42,600 square kilometers, accounting for about 20% of the total land in Hunan Province. The natural environment in this area has the following characteristics. 1. Wide range of hills, steep slopes The area has Wuling, Xuefeng two vertical mountains, high terrain, hilly area accounts for about 90% of the total land area, steep slopes, large elevation difference. Yuanjiang, Liushui through the mountains, the formation of deep canyons, lowland little.