The reserve was established in 1979 specifically to protect the dunes from the encroachment of maritime sand that historically threatened the Aveiro estuary.
The peninsula itself is a dynamic geomorphological feature, with the coastline shape frequently altered by Atlantic storms and tidal currents.
The park contains one of the few remaining examples of native maritime pine forests in the coastal region.
It acts as a critical biological corridor for waterbirds moving along the Atlantic flyway between northern Europe and Africa.
The dune system is classified as a protected coastal area under the Natura 2000 network.
Reserva Natural das Dunas de São Jacinto is a protected coastal dune system situated on the narrow peninsula separating the Atlantic Ocean from the Aveiro Lagoon. The park covers approximately 700 hectares of varying ecosystems, including shifting dunes, pine forests, and marshes. It serves as a vital habitat for migratory birds and local fauna, such as the Iberian water frog and the European otter. Visitors access the park via a network of wooden boardwalks designed to protect the fragile sandy terrain from erosion. The trails wind through distinct habitats, transitioning from salt-tolerant beach vegetation to dense maritime pine stands. It is a strictly controlled natural area where environmental preservation takes precedence over tourist infrastructure.
The raised wooden walkway sections that overlook the intersection of the pine forest and the marshy lagoon edges.
Bring binoculars as the elevated bird-watching hides offer the best views of the lagoon's avian life.
Apply sunscreen and bring head protection, as the wooden boardwalks offer minimal natural shade.
Pack water and snacks, as there are no food or beverage facilities located within the reserve boundaries.
Attempting to walk through the sand dunes outside of designated paths, which causes significant erosion and is prohibited.
Stay strictly on marked wooden walkways to prevent damage to the delicate dune vegetation; do not disturb wildlife or remove sand/plants.
