Largest tributaries
Moroniformes - Temperate basses
Anguilliformes - Eels and morays
Pleuronectiformes - Flatfishes
At the end of its journey, the river Mersey widens into a large estuary, which is 3 miles (4.8 km) across at its widest point near Ellesmere Port. The course of the river then turns northwards as the estuary narrows between Liverpool and Birkenhead on the Wirral Peninsula to the west, and empties into Liverpool Bay.
