Force Covering Area File:Northumbriapolice.gif Northumbria Police Districts File:NorthumberlandNumbered.png Blyth Valley Wansbeck Castle Morpeth Tynedale Alnwick Berwick-upon-Tweed File:Long Crag summit.jpg Northumberland is a county in the North East of England . The non-metropolitan county of Northumberland borders Cumbria to the west, County Durham to the south and Tyne and Wear to the south