The land between them, known as the Ouse Washes, often floods and forms part of an internationally important wetland habitat.
River Ouse | River Great Ouse | River Ouse, Yorkshire | Ouse Washes | Ouse | View from the ''Marshland'' bird hide, with a ship, on River Ouse, Yorkshire | river Great Ouse | ''Pilate Washes His Hands'' by James Tissot | Ouse washes | Ouse, Tasmania | Ouse Bridge |
The area is bounded on the northwest and east by the Nene and Ouse washes, on the north by previously drained Marshland silts and to the south and west by low clay hills.