Guangdong
Guangdong (; formerly romanised as Kwangtung or Canton Province) is a province in South China, on the South China Sea coast. Guangdong surpassed Henan and Shandong to become the most populous province in China in January 2005, registering 79.1 million permanent residents and 31 million migrants who lived in the province for at least six months of the year; the total population was 104,303,132 in the 2010 census, accounting for 7.79 percent of Mainland China's population. This also makes it the most populous first-level administrative subdivision of any country outside of South Asia, as its population is surpassed only by those of the Pakistani province of Punjab and the Indian states of Bihar, Maharashtra and Uttar Pradesh. The provincial capital Guangzhou and economic hub Shenzhen are among the most populous and important cities in China. The population increase since the census has been modest, the province registering 108,500,000 people in 2015.
List of administrative divisions of Hainan
Hainan uses a slightly different administrative system from the other provinces of China. Most other provinces are divided entirely into prefecture-level divisions, each of which is then divided entirely into county-level divisions, which generally do not come directly under the province. In Hainan, nearly all county-level divisions (the eight districts excepted) come directly under the province. This method of division is due to Hainan's relatively sparse population.However,it's planned that the counties and cities in Hainan（excluding Sansha）would be merged into five city-level cities,just as those on the mainland area of China administratived by PRC.