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An oil field is a region with an abundance of oil wells extracting petroleum (crude oil) from below ground. Because the oil reservoirs typically extend over a large area, possibly several hundred miles across, full exploitation entails multiple wells scattered across the area. In addition, there may be exploratory wells probing the edges, pipelines to transport the oil elsewhere, and support facilities. Because an oil field may be remote from civilization, establishing a field is often an extremely complicated exercise in logistics. This goes beyond requirements for drilling, to include associated infrastructure. Workers require housing to allow them to work onsite for months or years. Housing and equipment require electricity and water. The typical oil field resembles a small, self-contained town in the midst of a landscape dotted with drilling rigs and/or the pump jacks, which are known as "nodding donkeys" because of their bobbing arm. No photographer credited, undated.