Himalayan Buddhism is a term used to collectivly refer to the Buddhist schools of Tibet, Nepal, Bhutan and those practiced in the Indian Himalayan regions of Ladakh, Himachel Pradesh, Sikkim and Arunachel Pradesh.
Himalayan Buddhism includes:
All these Buddhist traditions are closely related historically and all include practices of both the Mahayana and Vajrayana traditions of Buddhism.
Ehrhard, Franz-Karl, "Buddhism, Schools of: Himalayan Buddhism", Encyclopedia of Religion (2nd ed.), Macmillan Reference, ISBN 0-02-865733-0