This overview encompasses the provinces of Yúnnán and parts of Sìchuān. Situated at the meeting point between Tibet, China, and Southeast Asia, this region is marked by diversity—geographic, biological, historical, cultural, ethnic, and linguistic. A major dividing line between the three realms runs along the southeastern ridge of the Tibetan plateau, separating the Tibetan world to the north and northwest (Non-Sinitic Languages of Tibet), the Sinit…