The Burmese and Thai originally came from, respectively,
1. Manchuria and Taiwan.
2. Tibet and southwestern China.
3. Sinkiang and Nepal.
4. South India and Honshu.
5. Sakhalin and Kwantung.
The Burmese and Thai originally came from, respectively, "2. Tibet and southwestern China,"--specifically the Tibetan highlands. Both of these locations are in southwestern Asia.
