Tourists who are eager to tour Tibet only can enter this autonomous region through mainland China or Kathmandu, Nepal. For all International tourists, the Tibet Travel Permit is required to
Aliens Travel Permit is a document issued by the Public Security Bureau in Tibet, the insiders call it PSB as well. Compared to the Tibet Travel Permit, you may not need it to travel in Tibet
Foreign tourists are required to get a Tibet Travel Permit to visit Tibet, and a Tibet tour operator will help you deal with the whole process of application.
Visiting the unopened area only with the TTB permit is not enough. Military Permit is additional needed if your itinerary included some military sensitive places
Remote destinations, such as Mount Everest, Zhangmu, Yadong, Mount Kailash, Manasarovar Lake, etc., are located in the border area between Tibet with other countries. To travel to these destinations, one has to obtain a Tibet Border Pass (or Frontier Pass) which is issued by Tibet Armed Police Border Corps in Lhasa
To take a flight to Tibet, jut passport and Chinese Visa are not enough. You have to obtain some special permits from Tibet Autonomous Region, such as Tibet Travel Permit, Tibet Border Pass, Tibet Military Permit. Some air routes require only Tibet Travel Permit, some require more permits.
Given the current spread of Coronavirus and the global recommendations and measure of the WHO, the government of Nepal has decided to temporarily suspend visa-on-arrival for the following the nationals: (effective from 10 March, 2020 to till the date of further notice)
Like other international tourists, for Indian citizens or Indian passport holders, the first priority is to get Tibet Visa (also known as Tibet Travel Permit, Tibet Permit).
Due to the impact of the novel Coronavirus in China, the processing of Tibet Travel Permit was temporarily suspended by Tibet Tourism and Development Bureau since Jan 27, 2020.