<page_title> TransCanada Corporation </page_title> <section_title> Operational natural gas pipelines </section_title> <table> <cell> Columbia Gas <col_header> Name </col_header> </cell> <cell> 18,113 km (11,255 mi) <col_header> Length </col_header> </cell> <cell> Transports natural gas from supply primarily in the Appalachian Basin to markets throughout the U.S. Northeast. <col_header> Description </col_header> </cell> </table>
Columbia Gas (18,113 km) is a natural gas transportation system that serves the Appalachian Basin.