China is regarded as one of the world's oldest civilizations. China's landscape is vast and diverse, ranging from the Gobi and Taklamakan
Deserts in the arid north to the subtropical forests in the wetter south. The Himalaya, Karakoram, Pamir and Tian Shan mountain ranges separate
China from much of South and Central Asia. The Yangtze and Yellow Rivers, the third and sixth longest in the world, respectively, run from the
Tibetan Plateau to the densely populated eastern seaboard. China's coastline along the Pacific Ocean is 14,500 km (9,000 mi) long and is bounded
by the Bohai, Yellow, East China and South China seas. China, officially the People's Republic of China, is a country in East Asia. It is
the world's second-most populous country with a population exceeding 1.4 billion. China spans the equivalent of five time zones and borders
fourteen countries by land, tied with Russia as having the most of any country in the world. With an area of nearly 9.6 million square kilometres (3,700,000 sq mi), it is the world's third largest country by total land area. The country consists of 22 provinces, five autonomous regions,
four municipalities, and two semi-autonomous special administrative regions. The national capital is Beijing, and the most populous city and largest financial center is Shanghai.
The region that is now China has been inhabited since the Paleolithic era, with the Yellow River basin being a cradle of civilization. The sixth
to third centuries BCE saw both significant conflict and the emergence of Classical Chinese literature and philosophy. In 221 BCE, China was unified
under an emperor, ushering in more than two millennia in which China was governed by one or more imperial dynasties, such as the Han, Tang, Ming and
Qing. Some of China's most notable achievements, such as the invention of gunpowder and paper, the establishment of the Silk Road, and the
building of the Great Wall, occurred during this period. The Chinese culture, including languages, traditions, architecture, philosophy and
more, has heavily influenced East Asia during this imperial period.
China has been experiencing the largest urbanization process in human history. China is evolving from villages to megacities. This trend
toward urbanization in China has been underway for four decades. In 1978, more than 80% of China's population lived in rural areas. Today, roughly 70% of the population live in China's new megacities. That translates to roughly 400 million people, more than the entire US population, moving into China’s cities in the past two decades. The same proportional transition took 90 years to happen in Europe, and 60 years in the US.
This large jump resulted from a combination of factors. One was the migration of large numbers of surplus agricultural workers, displaced
by the agricultural responsibility system, from rural to urban areas. Urbanization in China greatly accelerated in the 1990s. During this decade, the percentage of China's population which was urban first reached 50%. Extensive urban planning efforts made this urbanization process orderly and, unlike other developing countries, China was able to eliminate large scale squatter towns and vilages. In older urban areas,
pre-revolutionary housing and danwei compounds were demolished.
Chinese engineering and technology have developed rapidly since the founding of the People's Republic of China in 1949. This growth has been especially dramatic following the adoption of national reform and openness policies nearly 20 years ago. China has trained a large number of
skilled architects, engineers and technicians across a range of disciplines. These professionals have played a major role in China's growth.
In the last decade, China has constructed the most tall buildings, bridges and railways in the world, and educated the greatest number of
engineering students, all of which requires advancement in science, engineering & technology. From 2010 to 2025, it is estimated by the Ministry
of Housing and Urban-Rural Development that 300 million Chinese now living in rural areas will move into cities. The fast pace of urbanization
will create at least one trillion yuan in annual investment opportunities in building water supply, waste treatment, heating and other public utilities
in the cities. The Chinese government is also demolishing rural villages and building new cities and towns to relocate villagers to. It ultimately aims to integrate about 70% of China's population, about 900 million people, into cities by 2025.
It is estimated that China's urban population will reach one billion by 2030, potentially equivalent to one-eighth of the world population. China
now has over 160 cities with a population of over one million, including the 17 megacities as of 2021. Cities with a population of over 10
million are Chongqing, Shanghai, Beijing, Chengdu, Guangzhou, Shenzhen, Tianjin, Xi'an, Suzhou, Zhengzhou, Wuhan, Hangzhou, Linyi, Shijiazhuang,
Dongguan, Qingdao and Changsha. Among them, the total permanent population of Chongqing, Shanghai, Beijing and Chengdu is above 20 million.
Shanghai is China's most populous urban area while Chongqing is its largest city proper, the only city in China with the largest permanent
population of over 30 million. By 2025, it is estimated that the country will be home to 221 cities with over a million inhabitants.
The birth of the megalopolis. China’s national urban development policy has shifted from expanding individual cities to systematically building
out massive city clusters, each of which will be home to as many as a hundred million people. Cities in a cluster will collaborate economically, ecologically, and politically. China has been the fastest growing economy in the world since the 1980. China is the world's second largest economy, just behind the United States. China is famous for several areas of study, including engineering. In terms of technology and
science, China has made advancements and innovations. China has a high technical expertise ranking, showing that they are one of the most
advanced countries in the world. China's infrastructure and engineering capabilities are evolving very rapidly, to keep pace with the
transformation of the country.