In this work, the tools of geoprocessing were used as a subject to elaborate a map of fires risk to the National Forest of São Francisco de Paula, State of Rio Grande do Sul, and also to determinate suitable spots for strategic location of two fire observation towers, that could help for the prevention and combats to fires in the forest. Mapping fire risk was achieved by following, basically, the methodology proposed by Vettorazzi & Ferraz (1998). In this way, using the image of the satellite Ikonos /I and topographical maps that corresponded to the study area, such as realizing practice works, it was possible to generate, at the software Idrisi for Windows (32 bits), 6 layers, which were integrated using GIS, giving place to a map of fires risk to the zone. This map, associated with otherinformation about the zone and of the local habits, allowed the determination of the spots to installate the towers. It was ended that the proposed methodology adapted to the study area, and that the zone needs a strategic plan of prevention and combats to fires because of its importance as a preservation area and due to its report of fires occurrence.In this work, the tools of geoprocessing were used as a subject to elaborate a map of fires risk to the National Forest of São Francisco de Paula, State of Rio Grande do Sul, and also to determinate suitable spots for strategic location of two fire observation towers, that could help for the prevention and combats to fires in the forest. Mapping fire risk was achieved by following, basically, the methodology proposed by Vettorazzi & Ferraz (1998). In this way, using the image of the satellite Ikonos /I and topographical maps that corresponded to the study area, such as realizing practice works, it was possible to generate, at the software Idrisi for Windows (32 bits), 6 layers, which were integrated using GIS, giving place to a map of fires risk to the zone. This map, associated with other information about the zone and of the local habits, allowed the determination of the spots to installate the towers. It was ended that the proposed methodology adapted to the study area, and that the zone needs a strategic plan of prevention and combats to fires because of its importance as a preservation area and due to its report of fires occurrence.Neste trabalho, as ferramentas do geoprocessamento foram utilizadas com o objetivo de elaborar um mapa de risco de incêndio para a Floresta Nacional de São Francisco de Paula/RS e determinar os locais mais adequados para a localização estratégicas de duas torres de observação de incêndios, que auxiliem na prevenção e combate de incêndios na floresta. O mapeamento de risco de incêndios foi realizado seguindo-se basicamente a metodologia proposta por Vettorazzi & Ferraz (1998). Assim, utilizando-se a imagem do satélite Ikonos II e cartas topográficas correspondentes à área de estudo, bem como com a realização de trabalhos de campo, foi possível gerar, por meio de interpretação visual, no software Idrisi for Windows (versão 32 bits), 6 Planos de Informação, os quais foram integrados através de SIG, dando lugar a um mapa de risco de incêndio da zona. Este mapa de risco, aliado às demais informações referentes ao terreno e aos costumes locais, permitiram determinar os melhores pontos para a instalação das torres. Concluiu-se que a metodologia proposta adequou-se a área em estudo, e que a zona necessita de um plano de prevenção e combate a incêndio visto a sua importância como área de preservação e devido a seu histórico de ocorrência de incêndios.