Kingston upon Hull (Hull) is a port city and unitary authority in the East Riding of Yorkshire, England. It lies on the Humber Estuary, 25 miles (40 km) inland from the North Sea. Hull is Yorkshire's fourth-largest city, about 50 miles (80 km) southeast of York, 29 miles (47 km) northwest of Grimsby, and 124 miles (200 km) northeast of Leeds.