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Mainland China from WikiPedia:

Mainland China, Continental China, the Chinese mainland or simply the mainland, is a geopolitical term that refers to the area under the jurisdiction of the People's Republic of China (PRC), excluding Hong Kong and Macau, which are under the jurisdiction of the PRC but run on different economic and political systems. The term never includes Taiwan which is claimed by the PRC but is administered by the Republic of China (ROC).

Within China, the use of "mainland China" to refer to China is more politically sensitive, mostly due to China claiming to have sovereignty over Taiwan; using the term "mainland China" would seem to imply that Taiwan is not a part of China and thus be inconsistent with this point of view. There are two terms in Chinese for "mainland". Namely, Dalu (simplified Chinese: ??; traditional Chinese: ??), which means continent, and Neidi (Chinese: ??), literally inner land. The usage of the two terms are generally interchangeable and there is no prescribed method of reference in any jurisdiction.

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