Tibet is a region located in the heart of Asia, situated on the vast Tibetan Plateau north of the Himalayas. It is often called "the roof of the world" due to its extremely high average elevation of about 4,380 meters (14,000 feet), making it the highest region on Earth

. Geographically, Tibet lies in the southwest of China and is currently administered as the Tibet Autonomous Region (TAR) of the People's Republic of China. It covers about 1.22 million square kilometers (around 470,000 square miles), which is roughly 12.8% of China's total area

. Tibet borders several Chinese provinces: Xinjiang to the northwest, Qinghai to the north, Sichuan to the east, and Yunnan to the southeast. Internationally, it shares borders with India, Nepal, Bhutan, and Myanmar to the south and southwest, and the disputed Kashmir region to the west

. The region includes the northern edge of the Himalayas, featuring some of the world's highest peaks, including Mount Everest on the border with Nepal. Tibet is the source of many major Asian rivers such as the Yangtze, Brahmaputra, Yellow, Indus, Mekong, and Ganges, earning it the nickname "Water Tower of Asia"

. In summary, Tibet is a high-altitude plateau region in Central and East Asia, located primarily within southwest China, north of the Himalayas, and bordering several South Asian countries