In China, the population is concentrated along the coast of China. The population densities are at least twenty five people per km² and in some areas, greater than one thousand people per km². In the United Kingdom, the population is concentrated in two areas, the south east of the UK, London, and the lower central area of the UK which is the Manchester and Birmingham area. The population density of these areas ranges from three hundred and fifty to six hundred people and over per km².China is heavily populated in Hong Kong, Beijing and Shanghai, which are all located on China’s coast. The areas mentioned above all have a booming economy which have attracted investors and have created more jobs. These new people chose to live close to their jobsite which is most likely in the mentioned cities which have then caused the dense population density in China. Trade is another factor because the ports in China are among the largest ports in the world for both cargo volume and container traffic. This trading opportunity has been taken advantage of by many people thus creating a “Chain Reaction” which is creating more shipping and transport companies which creates more jobs and in turn causes more people to flock to the cities. The rainfall also is greater in the heavily populated areas thus creating more water for consumers and for agricultural lands.The mountainous areas are sparsely populated, in most cases because of little rainfall, extreme weather, slow economy, less job opportunities, hardly any transportation and little resources. In the far north west of China, there is some average to dense population where numbers ranging from twenty five to nine hundred and ninety nine people per km². This is because of the rivers from the nearby mountains creating a water supply and the rainfall is sufficient. Also the lands in this area are close to flat land making transportation an ease.In the United Kingdom, the south eastern coast is one out of the two most populated areas is London. London was the biggest city from 1831 to 1925. London, at this time was one of the most developed cities of that era which incited immigration for either a better standard of life or better job opportunities. As time passed the immigrants began reproducing and boosting the population density. Also, London’s port is among the biggest ports of the world which encourages more imports and exports which increases the UK’s economy which then creates the “Chain Reaction” mentioned above. Moving to Manchester and Birmingham, this area is very historic area also so it attracts many tourists who eventually migrate to this part of the UK. Here also has a thriving economy which originates from trade, tourism and resources. The thriving economy will also create the “Chain Reaction”Moving further north of the UK, there is a sparse density of people in these areas, mainly because these areas are mountainous. In the mountains, limited types of crops and animals can be grown and reared because of the weather. The weather is very harsh and temperatures are very low. Transport is not easily accessible form mountainous areas thus causing not very livable conditions for people residing here.I think that in both countries, the physical factors are more important because the countries both have coastal features which some of the biggest ports in the world are built. Trade plays a significant role in both countries’ economy which causes the “Chain Reaction” mention earlier, and a better standard of living thus increasing the population densities in the cities. Dense cities such as London are built right along the river Thames which also sparks opportunities for settlements being made. Sparse areas are usually sparse because of the unlivable conditions due to rainfall, mountains and temperature.