"the Essex marshes"
John Constable's painting of Hadleigh Castle overlooking the Essex marshes and Thames estuary (1829)
Public DomainJohn Constable's painting of Hadleigh Castle overlooking the Essex marshes and Thames Estuary (1829) - Credit: Yale Center for British Art

The Essex marshes are found along the Essex coast, stretching from the River Thames in the south to the River Stour and Harwich in the north.