The Castro de Troña is a castro from the castrexa period that, like many of the castrexa settlements in Galicia, had its heyday around the 1st century BC. and the 2nd century AD.
It is one of the archipelagos belonging to the National Maritime-Terrestrial Park of the Atlantic Islands of Galicia, along with the Ons, Sálvora and Cortegada Islands.
Thanks to their richness, both fauna and vegetation, and the spectacular nature of their landscapes, these islands constitute an important cultural and natural heritage of great value.
To access it is necessary to go by boat, by purchasing tickets in advance.