The present thesis consists of a mapping of the geossociolinguistic profile of the Portuguese language in contact with languages belonging to the Tupí-Guarani family, in indigenous areas in the states of Pará and Maranhão, aiming at contributing to the knowledge of the linguistic attitudes of speakers and the phonetic variation of Portuguese language in contact with five indigenous languages, which are: Suruí Aikewára, Asuriní from Tocantins, Tembé, Guajajára and Guaraní Mbyá. The theoretical-methodological assumptions of Dialectology and Linguistic Geography (GILLIERON, 1902; NASCENTES, 1953; ROSSI, 1963), Modern Dialectology and Geosociolinguistics (RAZKY, 1996; CARDOSO, 1999; AGUILERA, 2008), Pluridimensional and Relational Dialectology (RADTKE; THUN, 1996), and languages contact (WEINREICH, 1953, FISHMAN, 1978 and THOMASON, 2001) guided this study. The methodological approach adopted was inspired by the instruments developed by the National Committee of the Linguistic Atlas of Brazil (ALiB), especially one of its instruments of data collection: the Phonetic-Phonological Questionnaire (PPQ), which has 159 questions. This questionnaire was adapted, including a request for the correspondence in the indigenous language for each of the answers obtained in Portuguese. In addition to the instrument, a Complementary PPQ with 37 questions was applied, aiming at the registration of phonetic phenomena specific to Portuguese contact with indigenous languages, and a Sociolinguistic Questionnaire of 21 questions on linguistic attitudes and metalinguistic/epilingual comments. Ten respondents per survey point, of both gender, stratified into three age groups (1: 5 to 10 years old, 2: 18 to 37 years old and 3: 47 to 75 years old) had been planned. The adults were divided equally into two levels of schooling (1st: illiterate to elementary school and 2nd: from high school to college). The analysis of the results showed that the Portuguese language spoke in these indigenous areas also showed influence of the linguistic substrate originated from Tupí-Guarani mainly in the speech of a portion of older informants (3rd age group) whereas the realization of the phones studied seem to be part of a speech continuum in relation to non-indigenous communities in the region (compared to Linguistic Atlas of Brazil – ALiB and Linguistic Sound Atlas of Pará – ALiSPA data). The results of the sociolinguistic mapping point to the diffusion of the Portuguese language and to a low degree of linguistic competence in the indigenous language among the youngest informants (1st and 2nd age groups), although there are indications of a process of awareness of these informants about the importance of maintaining indigenous languages from their communities.
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