The Trent, the third-longest river in the United Kingdom, has its source in Staffordshire, on the southern edge of Biddulph Moor. It flows through and drains the North Midlands into the Humber Estuary. The river is known for dramatic flooding after storms and spring snowmelt, which in the past have often caused the river to change course.
The river passes through Stoke-on-Trent, Stone, Staffordshire, Rugeley, Burton-upon-Trent and Nottingham before joining the Yorkshire Ouse at Trent Falls to form the Humber Estuary, which empties into the North Sea between Kingston upon Hull in Yorkshire and Immingham in Lincolnshire. The wide Humber estuary has often been characterised as the boundary between the Midlands and Northern England ("The North").