《资治通鉴·唐纪·唐纪四十》
如今从河州、陇州到扶州、文州，绵延二千多里，安扶和防御十分困难。
今自河、陇达于扶、文，绵亘二千馀里，抚御至难。
Today, from Hezhou and Longzhou to Fuzhou and Wenzhou, the total length is more than 2,000 miles, and it is quite difficult to care for and defend them.