These are subject to change and depend on whether you join the trip in Kathmandu or China. If you are joining the trip in Kathmandu you will need a multiple entry visa for Nepal which can be obtained either from your nearest Nepalese consulate or on arrival in Nepal.
For Tibet, we organize a group visa, and in order to do this we will need a copy of your passport at least 20 days prior to the commencement of your trip, followed by your actual passport five days before the visa issuing days. If you are entering via mainland China you have to obtain Chinese visa from you home country. Visa regulation in Tibet keep changing please ask us for latest Tibet visa information.