Duddon Estuary

It opens into the Irish Sea to the north of the Furness peninsula; Walney Island forming part of its southern edge.

The main settlements alongside the Duddon estuary are Haverigg, Millom, Foxfield, Kirkby-in-Furness, Askam and Ireleth and Barrow-in-Furness.

It qualified under three criteria: In 2015, before the United Kingdom European Union membership referendum, there were consultations on a successful proposal that Morecambe Bay and Duddon Estuary be combined in a new SPA.

This would amalgamate the existing Morecambe Bay and Duddon Estuary SPAs and would add marine areas identified as being used by foraging terns.

Development has had no significant effect on the nature conservation interest of the estuary, but it is at risk from coastal defence works, grazing by agricultural stock, sea level rise, recreational pressure and bait digging.