The Pyrenees range is a transboundary region shared by Spain, France and Andorre. As many other mountainregions, it is excedentary in water resources that are used in a much larger area that includes important urbanconcentrations and productive rural areas. This territory is particularly vulnerable to the consequences of climatechange. The PIRAGUA project, funded by FEDER through the POCTEFA Programme of the EU, addresses theassessment of the hydrological cycle of the Pyrenees in the context of climate change. The goals of the projectare to unify and homogenise the existing information, prospect future scenarios, develop indicators of change, andpropose adaptation strategies with impact on the territory, with the ultimate goal of supporting investment aimedat adapting to climate change in relation to water resources. Thus, the project evaluates the components of thehydrological cycle and the water resources of the Pyrenees range in the recent past (1985-2015), and in futurescenarios (2030-2050). In addition, it will develop seven case studies about adaptation strategies at the local andregional scales, focusing on different socio-economic sectors, including hydropower production; sensitive head-water ecosystems; water and forests; irrigation agriculture; extreme events; tourism and areas of high ecologicalvalue; and multi-sector analysis, including the water-energy connection.