Zhangye is located in central along the , occupying 42,000 km (16,000 sq mi). It takes up the entire breadth of the province, running from on the north to on the south, but its urban core is at in the formed by the or Hei River. Its streams, sunlight, and fertile soil make it an important regional agricultural centre, although it was ser. [pdf]
This article lists the main components of a onshore . rigs have similar elements, but are configured with a number of different drilling systems to suit drilling in the marine environment. The equipment associated with a rig is to some extent dependent on the type of rig but typically includes at least some of the items listed below. [pdf]
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