If those not living in the Tibet Autonomous Region are not excluded , ethnic groups such as the Balti ( indigenous people ) and Burig , who are also of Tibetan origin and consider themselves to be ethnically Tibetan , are Muslims as well . If those not living in the Tibet Autonomous Region are not excluded , ethnic groups such as the Balti and Burig , who are also of Tibetan origin and consider themselves to be ethnically Tibetan , are Muslims as well .