China is the most heavily populated country in the world. Over 1.33 billion in fact, over 40% urban. Stringent population controls have been in place for several decades, and the government aims to limit the mainland population to 1.37 billion by 2010. However, the population of great Beijing, for example, is approaching 15 million, and the cities can be crowded and noisy in parts, as can the buses, trains, tourist sites etc.