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The lagoon environments were places recurrently visited and inhabited by hunter-gatherer groups throughout different areas of North Patagonia. These places were very important in the life of these mobile groups; they were part of their itineraries and they regularly returned to their shores. The Somuncurá plateau's lagoons (Rio Negro province, Argentina) represent one of these spaces, where, in addition to a vital resource such as water, it can be found a greater variety and biological abundance, facilitating a certain shelter during mobility. The Laguna Azul site is one of these places, where the hunting blinds (known as "parapetos") are the most outstanding anthropic modification of the landscape. In this paper, we present the results obtained from the lithic material recovered from one of these structures, which is the most abundant material in the record. The knowledge about the specific uses of these stone tools, obtained through the functional analysis, is deepened to determine trends in the manufacturing process and designs chosen. The studies developed in this paper will expand the understanding about the technological decisions implemented by the hunter-gatherers that inhabited the Somuncurá plateau during the Late Holocene. [ABSTRACT FROM AUTHOR]