The Westcoast Pipeline, also known as the Westcoast Transmission System or the BC Pipeline, is a natural gas pipeline in British Columbia that brings natural gas from the Western Canadian Sedimentary Basin south to the province's heavily populated Lower Mainland. It connects to the Northwest Pipeline in the United States and east to TransCanada pipeline. Built in 1957 by Frank McMahon's Westcoast Transmission Co. Ltd., the 650-mile gas pipeline from Taylor in north-eastern British Columbia to the United States was Canada's first "big-inch" pipeline.