Zhang

Until the recent construction of a system of roads, the Wei River was northern Henan Province's principal link with the outside world, connecting it with the Grand Canal and thence the city of Tianjin and the sea.…In addition, just to the northwest of the county lies the tempestuous Zhang River; usually shallow, it becomes a raging torrent during heavy monsoon rains, flooding the border area of northern Henan and southern Hebei provinces.