From Stamps of the World
The Tibet Autonomous Region (TAR) or Xizang Autonomous Region, called Tibet or Xizang (Tibetan: བོད་; Chinese: 西藏; pinyin: Xīzàng) for short, is a province-level autonomous region of the People's Republic of China (PRC). It was created in 1965 on the basis of Tibet's incorporation by the PRC in 1951. 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, spanning over 1,200,000 square kilometres (460,000 sq mi), after Xinjiang, and mostly due to its harsh and rugged terrain, is the least densely populated provincial-level division of the PRC.
The Central Tibetan Administration (CTA; Tibetan: Tsänjöl Bhömī Drikdzuk, Tibetan pronunciation: [t͡sɛ̃́t͡ɕø̀ː pʰỳmìː ʈìʔt͡sùʔ], literally Exile Tibetan People's Organisation), is an organisation based in India with the stated goals of "rehabilitating Tibetan refugees and restoring freedom and happiness in Tibet". It is also referred to as the Tibetan Government in Exile, but while its internal structure is government-like, it has stated that it is "not designed to take power in Tibet"; rather, it will be dissolved "as soon as freedom is restored in Tibet" in favor of a government formed by Tibetans inside Tibet. In addition to political advocacy, it administers a network of schools and other cultural activities for Tibetans in India. On 11 February 1991, the CTA became a founding member of the Unrepresented Nations and Peoples Organization (UNPO) at a ceremony held at the Peace Palace in The Hague, Netherlands. Please note that postmark categorisation for Tibet is both China (CN) and Tibet (CN-54) to maintain in both categories.