Natural gas is found and collected in many of the same areas as crude oil. As with crude, smaller gathering lines collect the natural gas from these sites and move it to larger, cross-country transmission lines. There are over a quarter million miles of these transmission lines crisscrossing the nation. These transmission lines deliver it to natural gas processing plants where impurities are removed and the end product, a clean burning gas, is again put into pipelines and delivered directly to homes and businesses via local distribution lines. The larger distribution lines near cities are called “mains” and they can be found along with the smaller lines under nearly every street of every town and city in the United States. Natural gas distribution lines easily comprise the vast majority of the mileage of pipelines in the nation, accounting for almost 2 million miles of pipelines.