Colônia Santo Antônio (Amaral Ferrador)  Colônia Santo Antônio is a district located in the city of Amaral Ferrador, Rio Grande do Sul, Brazil. Approximately 80 years ago, Colônia Santo Antônio was called "Tubuna" and Amaral Ferrador was called "São José" at that time Colônia Santo Antônio was a town of Encruzilhada do Sul.