《汉书·志·地理志上》
巫县，夷水向东到夷道流入长江，经过两个郡，行程五百四十里。
巫，夷水东至夷道入江，过郡二，行五百四十里。
Wuxian County, Yishui flows eastward to Yidao and flows into the Yangtze River, passing through two counties, with a journey of 540 miles.