Is Xinjiang and Xizang two of the most densely populated regions China Proper?

No, Xinjiang and Tibet are not two of the most densely populated regions in China Proper. In fact, they are two of the most sparsely populated regions. Xinjiang is the largest province in China by land area, but it has a population of only about 25 million people, making it one of the least densely populated regions in the country. Tibet is also a large province, but it has a population of only about 3 million people, making it the least densely populated region in China.

The most densely populated regions in China Proper are the eastern coastal provinces, such as Jiangsu, Zhejiang, and Guangdong. These provinces have populations of over 100 million people each and are home to some of the largest cities in China, such as Shanghai, Beijing, and Guangzhou.