|Transportadora de Gas del Sur SA (TGS) is an Argentina-based company engaged in the exploitation, distribution and commercialization of natural gas. TGS's pipeline system connects gas fields in southern and western Argentina with gas distributors and industries in those areas and in the greater Buenos Aires area. The Company also renders midstream services, which consist of gas treatment, removal of impurities from the natural gas stream, gas compression, wellhead gas gathering and pipeline construction, operation, and maintenance services. The Company operates in three segments: natural gas transportation services through its pipeline system; natural gas liquid production and commercialization, and midstream services. As of December 31, 2010, TGS held interest in such subsidiaries and affiliates as Transporte y Servicios de Gas en Uruguay SA, Gas Link SA and Emprendimientos de Gas del Sur SA.