Complexo Intermareal Umia-O Grove

Complexo Intermareal Umia-O Grove is one of the most significant protected natural areas on the Galician coast, stretching along the Ría de Arousa across several municipalities, including Cambados, O Grove, Sanxenxo, Meaño, Ribadumia and A Illa de Arousa. Covering more than 2,800 hectares in total, this wetland complex combines river mouths, dune systems, a coastal lagoon and tidal flats into a mosaic of habitats of exceptional value for waterbirds.

Why is this area so ecologically important?

The site carries an unusually dense stack of protection categories: it is a Fauna Refuge, a Special Protection Zone for Birds (ZEPA), a wetland of international importance under the Ramsar Convention, and part of both the Natura 2000 network and the Complexo Ons-O Grove Special Conservation Zone (ZEC). Few natural sites accumulate this many overlapping designations, which reflects how highly regional and international authorities rate its ecological value.

What are the three parts of the complex made of?

Complexo Intermareal Umia-O Grove is not a single continuous area but three spatially separate wetlands. The first is a wide inlet formed at the mouth of the Río Umia, closed off by the isthmus that carries the beach and dune system of A Lanzada. The second is the Bodeira lagoon, a freshwater coastal lagoon located on the western side of the O Grove peninsula. The third is Punta Carreirón, a headland at the southern tip of the Island of Arousa. Each of these three areas has a distinct habitat character, which increases the overall diversity of species found across the complex.

What birds can be seen here?

Waterbirds are the main reason this site holds such a high conservation status. In winter, more than 20,000 individual birds from around 200 different species have been recorded here. The extensive shallow waters, mudflats and lagoon provide excellent feeding grounds for migratory and wintering birds, while the rich salt-marsh and coastal vegetation supports nesting for many species throughout the year.

What else stands out about the flora and fauna?

Beyond its bird populations, the area is notable for its marsh and salt-tolerant plant communities, typical of estuaries along Galicia's Atlantic coast. The dune systems, such as the one at A Lanzada, create their own microclimate and habitat for species adapted to salty soil and strong coastal winds. The Bodeira lagoon, being a freshwater body sitting right next to the coastline, adds yet another distinct ecosystem type to an already varied complex.

Frequently asked questions

Where exactly is Complexo Intermareal Umia-O Grove located? It lies on the coast of the Ría de Arousa in Galicia, spanning the municipalities of Cambados, O Grove, Sanxenxo, Meaño, Ribadumia and A Illa de Arousa.

How large is this protected area? The whole complex covers approximately 2,813 hectares, including both terrestrial and marine areas.

Why does the site hold so many protection designations at once? Because of its outstanding importance for waterbirds and the diversity of its wetland habitats, it has been granted national protection (Fauna Refuge, ZEPA), European protection (Natura 2000, ZEC) and international protection (Ramsar Convention).

What are the three main parts of the complex? They are the inlet at the mouth of the Río Umia with the A Lanzada dune system, the Bodeira lagoon, and the Punta Carreirón headland on the Island of Arousa.

Is this a good place for birdwatching? Yes — in winter more than 20,000 birds from about 200 species can be observed here, making it one of the most important birdwatching sites on the Galician coast.