Its capital city is Rio Branco and other important cities are : Cruzeiro do Sul , TarauacÃ , Sena Madureira , and BrasilÃ ia . Its capital is the city of Rio Branco . Other important places include : Cruzeiro do Sul , FeijÃ , Sena Madureira , Senador Guiomard and TarauacÃ .