佛祖統紀 32.5

32.5

漢盛時。四履之地。東樂浪。西敦煌。南日南。北雁門。東西九千里。南北萬三千里。

In the flourishing times of the Han, the lands within its four bounds were Lelang to the east, Dunhuang to the west, Rinan to the south, and Yanmen to the north: nine thousand li from east to west, and thirteen thousand li from south to north.