Pateira de Fermentelos is the biggest natural lake in Portugal and one of the largest freshwater lakes of the Iberian Peninsula with a mosaic of wetland habitats, reed beds, marshland and riparian vegetation.
The term “Pateira” refers to a specificity of the region making itself mention to the abundance of ducks.
The site supports important populations of migratory and threatened bird species.
Fish also find favorable ecological conditions for refuge and spawning during the breeding season.
The wetland has a major role in groundwater recharge, flood control, sediment trapping and maintenance of water supply.
The largest threat factors which might affect the ecological status of the site are essentially intensive farming, invasive species and contamination by industrial and urban infrastructures.
This sensitive and and important wetland is part of NATURA 2000 network.
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