This article intends to examine the socio-spatial changes in Praia Brava-Itajaí / SC, caused by urban sprawl and tourism, in this bordering area between the cities of Itajaí and Balneário Camboriú, in recent decades. The study is based on theoretical proposals by M. Santos (1982 and 2009) and A. Cholley (1964) that favor the identification of natural and humane elements responsible for concrete realities, spatially and temporally defined. It is also supported by the ideas of I. Rangel on the evolution of Brazilian social formation, expressed in the theory of duality (2005), associated with the cyclical development of the capitalist system. The accelerated urbanization, coupled with the increase in tourism, attracted the attention of real estate capital and local politicians to this space, creating problems that are increasing the tension between community associations and the interests of private groups with influence over the government.