Location and Methods of Investigation
Lanzhou (N36°02′ and E103°48′) is located in Northwestern China. It is the capital of Gansu Province. Its population is 3.68 million people (in 2016). The total area is 13085.6 km2. It is located in the upper reaches of the Yellow River, near the border between the Tibetan Plateau, the Loess Plateau, and the Inner Mongolia Plateau (Fig. 2.1). Lanzhou is an industrial city with a developed chemical, oil, and flower industry, manufacturing of heavy equipment and coal, and production of electricity from plants. Lanzhou has a major railroad, road, and air hub for the whole Northwestern China. For this reason, Lanzhou became an important strategic and trading center on the Silk Road in ancient times.
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