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Limits to regional flow in Guarani Aquifer System (GAS), produced by two lineaments, named Rio das Antas (RAL) and Rio Forqueta (RFL), had been identified in northeast Rio Grande do Sul State, Brazil. Thermometry and hydrochemistry were decisive criteria in flow barriers identification. The block of GAS located northeast from these lineaments presents hot waters (28,6 oC to 46,7oC) and hydrochemistry compatible with long residence time. To the south of RAL and west of RFL, waters are cold (19oC 21oC) and have chemical composition related to the exploited aquifer: Botucatu and Passo das Tropas, respectivelly. Potentiometric gradient can’t identify both flow barriers (RAL and RFL). To the south of RAL, hydraulic head distribution suggests existence of divergent flow, directed to Rio das Antas and Rio Cai valleys. RAL flow barrier is due to a horizontal heterogeneity (faulting); whereas the RFL one is vertical: Serra Geral and Santa Maria Formations being in direct contact. The limits defined by RAL and RFL for a cell flow in Guarani Aquifer System will eliminate discrepancies between modeled and observer hydraulic heads to the south of Rio das Antas valley. Key words: Guarani Aquifer, thermometry, hydrochemistry, lineament.

TERMALISMO E HIDROQUÍMICA COMO EVIDÊNCIAS DE LIMITE DE FLUXO REGIONAL NO SISTEMA AQÜÍFERO GUARANI NO SUL DO BRASIL