Atlantic Islands of Galicia National Park

Atlantic Islands of Galicia National Park

Protected Natural Area

Thanks to its marine and terrestrial biodiversity, the Ons Archipelago became a part of the Galician Atlantic Islands Maritime-Terrestrial National Park in 2002, together with the Cíes, Sálvora and Cortegada archipelagos. Its underwater depths are a significant nature reserve serving as a breeding ground for many species.


On the Ons Archipelago, it rains nearly half as much as in the nearby coastal areas, which shows the important effect of insularity on the climate. The annual average precipitation stands at round 800-900 mm.

This pleasant climate is the warmest in Galicia, with an annual average temperature ranging 13 and 15 degrees Celsius. This fluctuation is more pronounced in summer and spring, when it reaches 18-20 degrees. Maximum temperatures of 35 degrees are reached in summer.


Terrestrial Flora

The terrestrial flora of the Ons Archipelago stands out for the existence of many endemic species. In this territory, there are plant species which became extinct millions of years ago in other areas of the planet, and specimens which have lived here for centuries, quietly witnessing the passage of time.

Terrestrial Fauna

Thanks to its geographical location, its special microclimate and its great variety of different ecosystems, the existence of different animal species is possible on Ons Island. The wide range of animal species inhabiting the island is similar to that of Cíes Islands and the other areas in the National Park.

The exceptional location of the Islands makes them a perfect habitat for different seabird colonies which choose them for their breeding or for making a stop in their long migration journeys.

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Marine Environment

The marine environment of Ons Island is a unique territory which offers shelter to a wide variety of species; many of which only exist in this small corner of the Atlantic Ocean. It stands out mainly for its biodiversity and the spectacular nature of its depths. It has to be remarked that 85% of the Maritime-Terrestrial National Park belongs to the ocean realm, which reaches 70-metre depths at some points. The marine areas of the park have a huge ecological value, both for their stunning underwater landscapes and their plethora of fauna and flora.

The diversity found on the seabed of Ons involves a great abundance of fishes and shellfish, which are very important for the local cuisine.

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