Because of the vast area of China that is covered with mountains that make it hard to inhabit said areas.
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Answer: A body of water is nearby to regulate the temperature and keep it more constant.
Explanation: Air that is in contact with the ocean will be much cooler from energy transfer between water and air, while air that sits above land will heat up much more quickly. Therefore, coastal climates are much more temperate because a body of water is nearby to regulate the temperature and keep it more constant.