Villaviciosa has a large array of Romanic and Pre-Romanic structures, including the architectural area consisting of San Salvador de Valdediós (declared a UNESCO World Heritage Site), as well as the Sta. María S. XIII church, the Oliva S. X church, San Salvador de Fuentes S.X, and San Juan de Amandi S. XII.
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Villaviciosa is situated in a valley formed by river erosion and flooding, creating what we currently know as the Ría that runs from Villaviciosa to the ocean, with the beautiful Playa de Rodiles on its right shore and the Puntal and Puerto de Tazones on the left.
In1995, the Villaviciosa estuary and its surroundings were declared a Partial Natural Reserve, whose uniqueness, wealth of vegetation, flora, and fauna make it a unique national wetland.