Can be sure Xi'an is delimited northwest concerns with geographical azimuth it doesn't matter above all, even if is to be in not the Western Regions (namely Xinjiang) before bringing into regnant limits, although Xi'an azimuth slants on the west, but do not calculate on northwest, plus long-term national capital addition, here often is called Central Plains.
Even if is now, map of lay open our country, can see apparently, shaanxi is located in our country mid, the earth origin of our country saves in relief county of short for the Jinghe River in Shaanxi, xi'an serves as the provincial capital of Shaanxi, come from geographical azimuth say, do not belong to northwest area absolutely.
It is in fact in natural division into districts, the northwest area that regards our country as one of 4 nature areas points to go in for sth in a large scale An Ling with on the west, golden hill of one A Er, a surname connects Kunlun hill hill the vast area with north, include north of greater part of ministry of Inner Mongolia Chinese and Western, Xinjiang, Ningxia and department of Gansu Province Chinese and Western roughly, do not include Shaanxi. (4 nature areas: ) of green Tibet area, northwest area, northern region, southern region.
And the 7 earths manage that what the northwest area in the title points to is our country is divisional (Hua Dong, Hua Na, China north, China medium, southwest, northwest, northeast) , include Shaanxi, Gansu Province, Qinghai, Ningxia and Xinjiang, this is administration go up differentiate.
Of administration differentiate to often consider the many sided factor such as politics, economy, military affairs, culture, and other places of the Qinghai of ministry of cc of short for Shaanxi Province, Gansu Province, Xinjiang, no matter be economy or population, dou Yuanxun the province at Shaanxi the eastpart part, for balanced and other think, xi'an begins from Ming Dynasty, it is the center of northwest area, continue all the time up to now.
