《资治通鉴·唐纪·唐纪四十》
如今国家的西部边境到达潘原，而吐蕃戍守摧沙堡，原州居其中间，正对着陇山山口，它的西部都是监牧故地，草肥水美，平凉在原州东部，是原州唯一的农耕县，可以供给军队食用，旧时的壁垒还在，吐蕃放弃了那块地方，不去居住。
今国家西境尽潘原，而吐蕃戍摧沙堡，原州居其中间，当陇山之口，其西皆监牧故地，草肥水美，平凉在其东，独耕一县，可给军食，故垒尚存，吐蕃弃而不居。
Today, the west border of China has reached the Pan Plain, while Tubo guarded Cao Sha fort, and Yuanzhou is right in the middle, facing the Longshan Pass. Its west was once the land of herds, with fertile grass and clean water and Pingliang in the east of Yuanzhou is the only agricultural county in Yuanzhou, which can provide food for the army, and the old remains are still there. Tubo gave up that place and didn’t live there. 