 WYMAS had 21 ambulance stations within its operating area.TENYAS was formed on 1 April 1999 as a merger of the former Cleveland, Humberside and North Yorkshire ambulance services and served the urban areas of Middlesbrough, York and Hull along with the rural areas of the Yorkshire Dales and Yorkshire Wolds.SYAS was formed in 1974 as the South Yorkshire Metropolitan Ambulance Service covering the then new metropolitan county of South Yorkshire.