Alaska Pipeline.

The main line of the pipeline starts from Prudhoe Bay on the North Slope and ends at Valdez in the Gulf of Alaska, with a total length of nearly 800 miles (about 1,300 kilometers) from north to south, passing through many cities such as Wiseman, Bettles, Livengood, Fox, Fairbanks, and Allen Valley. The construction of the pipeline also faces the challenges of remote location and harsh surrounding environment: it has to cross three mountain ranges, active faults, vast permafrost, and regularly migrating reindeer and moose. Since its completion in 1977, the pipeline has transported 15 billion barrels of crude oil (2.4 km3).