The Port of Hull is a port at the confluence of the River Hull and the Humber Estuary in Kingston upon Hull, in the East Riding of Yorkshire, England. Seaborne trade at the port can be traced to at least the 13th century, originally conducted mainly at the outfall of the River Hull, known as The Haven, or later as the Old Harbour. In 1773, the Hull Dock Company was formed and Hull's first dock built on land formerly occupied by Hull town walls.