Kingston upon Hull, usually abbreviated to Hull, is a port city and unitary authority in the East Riding of Yorkshire, England. It lies upon the River Hull at its confluence with the Humber Estuary, 25 miles (40 km) inland from the North Sea, 50 miles (80 km) east of Leeds, 34 miles (55 km) south-east of York and 54 miles (87 km) north-east of Sheffield. With a population of (), Hull is the fourth-largest city in the Yorkshire and the Humber region.