《徐霞客游记·江右游日记七》
有几户人家住在溪岸边，地名叫三江口，我猜想就是两条溪水与吁江在此汇合，所以叫这个名。
有数家在溪上，曰三江口，想即二溪与盱江合，故名也。
Several homes were situated on the riverbank, a place called Sanjiangkou. I conjectured that this was where two rivers converge into the Xu River, hence the name.