Sirionó language
Sirionó is a Tupian language spoken by about 400 Sirionó people and 120 Yuqui in eastern Bolivia in the village of Ibiato and along the Río Blanco in farms and ranches.
Phonology
Sirionó has phonemic contrasts between front, central, and back, close and mid vowels, i.e.| Front | Central | Back | |
| Close | i ĩ | ɨ ɨ̃ | u ũ |
| Mid | e ẽ | ə ə̃ | o õ |
| Open | a ã |