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16. Glacial Lakes and Peat Bogs of Porto

The retreat of the glaciers at the end of the last Ice Age shaped much of Porto’s landscape. Where the ice carved hollows and depressions, mountain lakes were formed, and in many of them a slow natural process gave rise to one of Europe’s most unique and valuable ecosystems: peat bogs.

Peat bogs are wetlands created by the accumulation of plant remains over thousands of years. They act as natural archives, preserving information about climate, vegetation and environmental changes that have occurred since prehistoric times.

The municipality of Porto contains one of the most important high-mountain peatland complexes in north-western Iberia. Notable examples include the Moncalvo, Alto Tera, Valdecasares, Majadavieja, Maseirón, Aguas Cernidas and Clara peat bogs, many of which are included in the Castile and León Wetlands Catalogue.

Beyond their ecological value, peat bogs play a crucial role in water regulation. They act as natural sponges, storing rainfall and gradually releasing it during dry periods, helping to maintain river and stream flows throughout the year.

These wetlands are also important allies in the fight against climate change. Although they cover only a small area, they store enormous amounts of carbon accumulated over thousands of years.

The lakes and peat bogs of Porto represent an exceptional natural heritage whose conservation depends on the respect and care of all visitors.