The mainland refers to
Mainland is what China people call Hongkong, Macau, Taiwan Province Province and overseas Chinese. People's Republic of China (PRC)'s actual territory outside the two special administrative regions of Hong Kong and Macao is within the scope of Chinese mainland, so Hainan Island, Zhoushan Islands and other maritime and island territories are regarded as a part of Chinese mainland.
China inland, also known as inland, geographically refers to the inland areas far away from the coastal areas, or inland areas outside the coastal areas. Generally, the inland areas north of the southern coast of China are called inland areas. The meaning of specification is the name of China inland except China coastal area, Hainan, Hongkong, Macau and Taiwan Province province.