False. Xinjiang and Xizang (Tibet) are **China's two largest provincial-level divisions by area**—but **among the least densely populated**, not the most.
| Region | Area (km²) | Population | Density (p/km²) |
|---|---|---|---|
| Xinjiang | 1,664,900 | 25.9M | 15.6 |
| Xizang (Tibet) | 1,228,400 | 3.6M | 2.9 |
| National Average | 9,600,000 | 1,409M | 147 |
| Jiangsu | 107,200 | 85.3M | 796 |
| Zhejiang | 105,500 | 66.3M | 628 |
| Guangdong | 179,800 | 126.6M | 704 |
| Shanghai (municipality) | 6,340 | 24.9M | 3,920 |
Refers to **Han-majority agricultural core** (Yellow & Yangtze basins). **Xinjiang & Xizang were never part of "China Proper"**—they were Qing expansions (18th C), later incorporated as provinces/ARs.
**Bottom line:** Xinjiang & Xizang = **vast, strategic, resource-rich, sparsely populated**—the *opposite* of dense.