The Santoña, Victoria and Joyel Marshes Natural Park is an estuary in Cantabria, protected as a natural park. It is one of the wetlands of most ecological value in the north of Spain, and is used as a winter refuge and migratory passage by many species of birds and fishes.

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Formed by the Asón River, the park occupies 3,866 hectares, distributed among the municipalities of Argoños, Bárcena de Cicero, Colindres, Escalante, Laredo, Limpias, Noja, Santoña and Voto.

• List of Ramsar sites in Spain