The North East Ambulance Service NHS Foundation Trust (NEAS) is an NHS foundation trust responsible for providing NHS ambulance services in North East England. Headquartered in Newcastle upon Tyne, NEAS provides emergency medical services to the metropolitan boroughs of Newcastle upon Tyne, Gateshead, North Tyneside, South Tyneside and City of Sunderland; the ceremonial counties of County Durham and Northumberland; and the area of North Yorkshire commonly known as Teesside. NEAS was formed on 1 July 2006, following the merger of the existing North East Ambulance Service with the Tees division of the Tees, East and North Yorkshire Ambulance Service (TENYAS). Northumbria Ambulance Service and County Durham Ambulance Service had previously merged on 1 April 1999.