Best natural monuments around Cacia are situated within a region rich in diverse natural landscapes, particularly those associated with the Ria de Aveiro. This area, a civil parish within the municipality of Aveiro, Portugal, offers a unique blend of fresh and saltwater ecosystems. The natural environment includes extensive lagoons, historic salt pans, and wetlands, providing habitats for various flora and fauna. These features contribute to the region's ecological significance and offer opportunities for outdoor exploration.
Last updated: June 29, 2026
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Salt mining in the Aveiro region dates back to a time before the Ria de Aveiro itself existed, with the first written document about Aveiro salt production dating back to before the founding of the nation. Over the centuries, the instability of the inlet (isolation from the sea) was a decisive factor in the variation in the number and production of salt pans. This resulted in periods of decline interspersed with periods of great favorability for production. This occurred in 1572, when, given the favorable condition of the inlet and the high and progressive commercial and maritime index, Aveiro became one of the best ports in Portugal, with a significant increase in salt trade and cod fishing. In 1808, the new inlet (an artificial system that allows seawater to enter) was finally opened, a fact of exceptional importance for the future of Aveiro and the entire region. (Source: Wikipedia) (Source: Wikipedia)⁶
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With 995.69 hectares, of which 733.48 hectares are on land and 262.21 hectares are marine, the Dunas de São Jacinto Nature Reserve is located in the "ria de Aveiro", on a thin sandy peninsula that separates the salt water from the brackish water, to which the Vouga River gives a "sweeter" taste.
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The protected area consists of 3 very different zones: the dune area which leads into a pine and acacia forest that was planted at the end of the last century to reinforce the dunes. Inside there are some freshwater ponds.
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The Ria de Aveiro (also known as Foz do Vouga) is a shallow coastal lagoon in the Aveiro region, extending for 45 kilometers. It covers two districts and several locations, including Aveiro, Ílhavo and Mira. It is divided into three main channels, one of which is the Canal de Mira, location of the bridge in question.
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The Ria de Aveiro, in Portugal, is an estuary rich in biodiversity. This aquatic ecosystem is famous for its meandering canals, salt marshes and diverse fauna. This point, specifically, is on EN 327, which runs parallel to the Ria for long kilometers, offering incredible views.
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Trailhead with info, restrooms, picnic tables. The trails into the reserve are not mean for bikes, and standard tires would have difficulties on the sandy soft sections. Note the resident mosquito population can be fierce due to the nearby wet areas.
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The bridge crosses the beautiful long extension of the coastal lagoon, stretching along the Lagoon from Aveiro to Vagueira
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The region around Cacia, within the wider Aveiro district, is characterized by its diverse natural landscapes, particularly those associated with the Ria de Aveiro. You can explore a shallow coastal lagoon system, extensive wetlands known as 'pateiras', and historic salt pans. These areas offer a unique blend of fresh and saltwater ecosystems.
Visitors frequently appreciate the Aveiro Lagoon - Mira Channel, a significant part of the Ria de Aveiro. Another popular spot is the View of the Salt Pans, Rua do Sal, offering insight into the region's historical salt production. The Duck ponds in the São Jacinto forest are also highly regarded for their unique ecosystem and wildlife.
The Ria de Aveiro, including the Aveiro Lagoon - Mira Channel, and the wetlands like Duck ponds in the São Jacinto forest and Pateira de Frossos, are excellent for birdwatching. These areas are crucial habitats for diverse aquatic birds, including sea swallows, stilts, dunlins, western ospreys, and flamingos, especially during winter when over 20,000 migrating birds are present.
Yes, the View of the Salt Pans, Rua do Sal offers a glimpse into the historical salt exploration in the Aveiro region, which predates the existence of the Ria de Aveiro itself. Records of salt production here go back even before the founding of Portugal, highlighting a long-standing traditional industry intertwined with the natural environment.
Many natural monuments in the Cacia area are family-friendly. Highlights such as the Aveiro Lagoon - Mira Channel, View of the Salt Pans, Rua do Sal, Pateira de Frossos, and Duck ponds in the São Jacinto forest are all categorized as family-friendly. The Aveiro Municipal Environmental Interpretation Center (CMIA) also offers educational and interactive exhibits suitable for all ages.
The region offers various outdoor activities. You can enjoy cycling along the wooden paths of the Ria de Aveiro, particularly the recently opened 7 km track. There are also numerous cycling routes, such as those found in the Cycling around Cacia guide and Road Cycling Routes around Cacia guide. Running trails are also available, with options like those in the Running Trails around Cacia guide.
The region is beautiful year-round, but for birdwatching, winter is particularly rewarding as over 20,000 migrating birds, including flamingos, are present. Spring and autumn offer pleasant temperatures for exploring the lagoon and wetlands on foot or by bike.
The duration of your visit depends on your interests. You could spend a few hours exploring a specific site like the Duck ponds in the São Jacinto forest or the Aveiro Municipal Environmental Interpretation Center (CMIA). To fully experience the Ria de Aveiro and its various channels and wetlands, including cycling or walking along its paths, you might want to dedicate a full day or even multiple days.
Yes, the View of the Salt Pans, Rua do Sal is a dedicated viewpoint offering scenic vistas of the traditional salt pans. Additionally, the walkable roof of the Aveiro Municipal Environmental Interpretation Center (CMIA) provides great views of the extensive wetlands and original saltworks landscape.
Yes, the Aveiro Municipal Environmental Interpretation Center (CMIA) is located right on the edge of the saltworks landscape. It offers an interesting exhibition with stuffed birds and other animal species, informative display boards, and expert staff. It also features a walkable roof with great views and binoculars available for use.
While popular, the extensive nature of the Ria de Aveiro system, including areas like Pateira de Frossos and the Duck ponds in the São Jacinto forest, allows for exploration away from larger crowds, especially during off-peak hours or seasons. The newly opened 7 km track along the lagoon also provides ample space for visitors.
While specific accessibility details for all sites are not provided, the recently opened 7 km track along the Ria de Aveiro is designed for walking or cycling, suggesting it may offer accessible sections. The Aveiro Municipal Environmental Interpretation Center (CMIA), as a modern facility, is likely to have accessibility features.


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