Translation of "Mainland" in Chinese

Tomorrow, I am coming back from Hong Kong to the mainland.

明天我要從香港去趟內地。

The mainland of China covers 96,000,000 square kilometers, and it is the largest country in Asia, as well as the third largest in the world.

中国陆地的总面积是960万平方公里，是亚洲面积最大的国家，居世界第三位。