Tibet is an autonomous region of China. Within China, Tibet is identified as an Autonomous Region. The current borders of Tibet were generally established in the 18th century and include about half of ethno-cultural Tibet. The Tibet Autonomous Region is the second-largest province-level division of China by area. Entering Tibet you feel as though you've entered an entirely different world. The traditional Tibetan culture, though diluted recently by government-sponsored migrations of Han and Hui Chinese, remains strong and central to the region.