China is the world's most populous country, with a whopping 1.4 billion people. In fact, many individual Chinese provinces would rank among the most populous nations on Earth in their own right. The economic powerhouse of southeastern Guangdong, China's most populous province, is home to as many people as Ethiopia. Up north, Heilongjiang's population is roughly the same as Australia's. Even the island of Hainan, China's least populous province, is equal in population size to the Eastern European nation of Belarus. Here's a map of China, in which each province is tagged as a country with a similar population size.