The viola caipira is a Portuguese folk intrument with ten strings in five courses, popular in Brazil. It appears to be a small guitar with ten light steel strings and is played with the fingers rather than with a plectrum.
The viola amarantina and viola braguesa are smaller versions of the same instrument.
Traditionally, many tunings are used.
Portuguese tunings of the viola caipira:
Viola Amarantina and Viola Braguesa standard (Portunguese) tunings are one fourth higher than the viola caipira:
Boiadeira tuning
Rio-abaixo tuning:
Many other open tunings are also used.