The city of Uyuni is in Bolivia, department of Potosí, is the Capital of the County Antonio Quijarro, this ubicate to the 3660 meters high, on the level of the sea. Salting of Uyuni is to 30 minutes of the city of Uyuni. Their people are gentile and kind with the visitors. 
Uyuni is considered the most important city in the Bolivian Southwest, the official currency he/she is the Bolivian, but there are also points of exchanges of different currency types like the dollar, euro, Argentinean, Chilean weight, suns, etc. Exists many banks for its attention, have much care when changing its notes, because false notes exist in dollars and Bolivian, the most advisable thing is to change the currency it is by means of the banks. Another caution is the one of not accepting North American currency that has a minimum of breaks since they won't be received then by anybody. This is very strange since you will see a lot of local currency in not well state.