Geography and climate

China is the second largest country in Asia by area after Russia, and is considered the third largest in the world in respect to land and sea area. The uncertainty over size is related to (a) the validity of claims by China on territories such as Aksai Chin and Trans-Karakoram Tract (both territories also claimed by India), and (b) how the total size of the United States is calculated: The World Factbook gives 9,826,630 km², and the Encyclopedia Britannica gives 9,522,055 km². China borders 14 nations (counted clockwise from south): Vietnam, Laos, Burma, India, Bhutan, Nepal, Pakistan, Afghanistan, Tajikistan, Kyrgyzstan, Kazakhstan, Russia, Mongolia and North Korea. Additionally the border between PRC and ROC is located in territorial waters.

The territory of China contains a large variety of landscapes. In the east, along the shores of the Yellow Sea and the East China Sea, there are extensive and densely populated alluvial plains, while on the edges of the Inner Mongolian plateau in the north, grasslands can be seen. Southern China is dominated by hill country and low mountain ranges. In the central-east are the deltas of China's two major rivers, the Yellow River and Yangtze River (Chang Jiang). Other major rivers include the Xi, Mekong, Brahmaputra and Amur.

To the west, major mountain ranges, notably the Himalayas, with China's highest point at the eastern half of Mount Everest, and high plateaus feature among the more arid landscapes such as the Taklamakan and the Gobi Desert.

A major issue is the continued expansion of deserts, particularly the Gobi Desert. Although barrier tree lines planted since the 1970s have reduced the frequency of sandstorms, prolonged drought and poor agricultural practices result in dust storms plaguing northern China each spring, which then spread to other parts of East Asia, including Korea and Japan. Water, erosion, and pollution control have become important issues in China's relations with other countries.

China has some relevant environmental regulations: the 1979 Environmental Protection Law, which was largely modeled on U.S. legislation. But the environment continues to deteriorate. While the regulations are fairly stringent, they are frequently disregarded by local communities while seeking economic development. Twelve years after the law, only one Chinese city was making an effort to clean up its water discharges. This indicates that China is about twenty years behind the U.S. schedule of environmental regulation.

Part of the price China is paying for increased prosperity is damage to the environment. Leading Chinese environmental campaigner Ma Jun has warned that water pollution is one of the most serious threats facing China. According to the Ministry of Water Resources, roughly 300 million Chinese are drinking unsafe water. This makes the crisis of water shortages more pressing, with 400 out of 600 cities short of water.