Terra is the largest manufacturer of Nitrogen products in the UK. It has two manufacturing sites in the UK: Billingham and Severnside. In addition there is a further production facility for Carbon Dioxide at Stanlow, Cheshire. Terra 's U.K. headquarters is situated very close to the Billingham site at Stockton-on-Tees. Details of Billingham and Severnside can be found by clicking on the relevant part of the map.