The Tibet travel permit is the primary document to get to visit Tibet. Tourism Bureau in Lhasa, Tibet, issues this travel document. This document is called in different ways by different tour service providers. Therefore, We are now familiar with the word such as the Tibet visa and Tibet permit. So it’s a different name for one single document just for you (foreign traveller) to travel inside Tibet Autonomous region of China. https://itibettravel.com/tibet-travel/tibet-travel-permit/