Vascão River (Ribeira do Vascão). 30/10/2012; Região Algarve; 44,331 ha; 37º27N 007º48W. Natura 2000 (SPA, SCI), Natural Park. Vascão River is the biggest river without artificial interruptions such as dams or reservoirs in Portugal. Situated in the Mediterranean Region, it supports high concentrations of threatened species of such freshwater fishes as Jarabugo (Anaecypris hispanica), European Eel (Anguilla anguilla) and Sea Lamprey (Petromyzon marinus). The wetland area regulates the Vascão River floods. The riparian vegetation contributes to underground water infiltration and stabilization of different hydrological processes. Numerous archaeological remains from the Roman and Islamic periods are found in the area, and it is popular for outdoor activities, nature sports, and environmental education. The lack of sewage treatment plants in the adjacent villages threatens the ecological character of the site, but management plans have been implemented together with restoration activities and invasive alien species eradication strategies. Ramsar Site Number: 2090. Most Recent RIS information: 2012.