Officially declared as a multilingual and multicultural country, Brazil has diverse multi-lingual situations in its territory. Within these we must add the context of the frontier, with regions that in the way they put people face to face with linguistic and cultural differences, are ripe for the exploitation of bilingual societies. In this work we will elaborate on a sociolinguistic portrait of the Franco- Brazilian frontier (Oiapoque and Saint Georges), taking as a base the contact between people with distinct languages and the result of this contact in the daily life of the inhabitants of one side or the other of the frontier, correlating the two realities and discussing questions relative to the linguistic politics present or absent in that region.