Coca-Cola’s most controversial bottling plant is a huge factory located in an industrial zone just outside the city of Urumqi in western China. Logistically, the factory is well situated: the international airport is a short drive away, as is the high-speed train station close to the fashionable Wyndham hotel. But the problem for Coca-Cola — and other western companies such as Volkswagen and BASF, which operate plants in the same region — is the existence of hundreds of facilities not mentioned on any official map.