Best natural monuments around Caldas Da Rainha include a diverse array of coastal features, urban green spaces, and significant geological formations. The region is characterized by its Atlantic coastline, expansive lagoons, and inland wetlands, offering varied natural landscapes. These sites provide opportunities for watersports, birdwatching, hiking, and appreciating local biodiversity. The area's natural monuments are accessible and cater to different interests, from serene walks to active exploration.
Last updated: June 23, 2026
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Penedo Furado dates back to the Jurassic period, when the sea bathed this inland area, close to Nadadouro. It is now a huge rock, light brown in colour and on the side facing the Óbidos Lagoon, signs of erosion are visible, with deep cavities and one of them ended up going through the rock, forming a passage.
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At this exact spot there is only a turning circle for cars - and Google Maps also shows the spot a few 100m further to the southwest: so there is nothing right here!
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The Pena da Gouvinha fountain used to serve the locals. There was a queue to fill the bottles, so much so that it was decided that each resident could only take eight bottles of water and would have to “give others a chance”. Today it serves as a stopping point to cool off during the walk and, if you wish, you can take advantage of the place to eat whatever you have prepared at home. There is a picnic area next to the fountain. The place name Pena da Gouvinha suggests that barbarians passed through here. Gouvinha is a personal name of Germanic origin, still documented in the 12th century as Gaudina.
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Salir do Porto has a river beach, on the bank of the Tornada River, which flows into the bay of São Martinho do Porto. Salir beach is famous for its sand dune about 50 meters high. Once the largest in Europe, the Salir Dune stands out in the dune landscape of São Martinho Bay. The core of the Dune is partly made up of red sandstone, a vestige of an older dune – a fossil dune. There are other rock beaches in the coastal area that are locally called Quebradas. It was in the Ruins of the artisanal Customs House of Salir that the caravels that participated in the discoveries and conquests were built during the reigns of D. Afonso V and D. João II. The extinct parish was made up of the towns of Salir do Porto, Casais de Salir do Porto and Bouro.
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Climbing up the sand dune and sliding down from the top is the highlight for everyone
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Be sure to go up there from the top, great view and slide down on your bum. Large dune that clings to the rocks there, perfect for hiking. At the foot of the dune, the Tornada river flows into the sea.
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The Óbidos Lagoon is a fascinating combination of natural beauty, cultural heritage and adventure activities. This coastal lagoon with its unique ecosystem
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Praia de Salir do Porto is next to the mouth of the Rio Tornada or Rio Salir on the south bank. The sand is very extensive, it is wider in the south and narrows as we walk north. This beach is known for its huge dune about 50 meters high, the highest in Portugal.
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Among the most popular natural monuments, visitors frequently highlight the Foz do Arelho Beach, known for its unique dual-sided beach where the Óbidos Lagoon meets the Atlantic Ocean. Another favorite is the Salir do Porto Dune, which is the highest dune in Portugal, offering impressive views. The tranquil Fonte Pena da Colvina, with its historic fountain and picnic area, is also a cherished spot for relaxation.
Yes, several natural monuments are ideal for families. Foz do Arelho Beach is particularly family-friendly, offering calm, shallow waters in the Óbidos Lagoon perfect for children. The adjacent Foz do Arelho viewpoint 📷 also provides accessible wooden walkways. The Fonte Pena da Colvina is another great option, featuring a picnic area for family outings.
The region is rich in biodiversity. The Óbidos Lagoon is a crucial habitat for migratory birds, especially in winter, with 175 identified species, making it excellent for birdwatching. The Paul de Tornada Local Nature Reserve is also a prime birdwatching spot, particularly for insect-eating birds like black swifts and warblers in summer. Further afield, the Serras de Aire e Candeeiros Natural Park is home to diverse fauna including bats, genets, wild boars, and various bird species.
The Óbidos Lagoon, adjacent to Foz do Arelho Beach, is a hub for watersports. Its calm waters are popular for kayaking, paddleboarding, windsurfing, kitesurfing, and sailing. The Alvorninha Dam also offers opportunities for canoeing in a peaceful natural setting.
Absolutely. The Óbidos Lagoon area features boardwalks and walking/cycling routes like the PR7 – Óbidos Lagoon Route. The Paul de Tornada Local Nature Reserve has the PR2 – Paul de Tornada Route for birdwatching. The Alvorninha Dam is part of the 'Caminhos da Rainha' walking trails. For more extensive options, you can explore numerous routes in the region, including those around Foz do Arelho Beach and Salir do Porto Dune. Find detailed hiking routes on the Hiking around Caldas Da Rainha guide.
The Salir do Porto Dune is Portugal's highest dune, offering unique sandy landscapes and panoramic views. The coastal cliffs of Serra do Bouro also provide breathtaking vistas. Slightly further, Serra do Socorro is a conical hill formed by an ancient volcano, showcasing distinct basalt formations and exceptional panoramic views. The Serras de Aire e Candeeiros Natural Park is renowned for its extensive karstic landscape, including numerous caves and sinkholes.
Within the city, Parque Dom Carlos I and the adjacent Mata Rainha Dona Leonor offer a significant urban green retreat. Parque Dom Carlos I is a romantic 19th-century park with a lake, walkways, and a café, while Mata Rainha Dona Leonor is a historic 17-hectare woodland with diverse trees, providing a serene environment for walks and picnics.
Yes, the area offers various options for running and cycling. The Óbidos Lagoon has dedicated walking and cycling routes. For running, you can find trails around Foz do Arelho Beach and the Óbidos Lagoon. Road cycling routes often incorporate scenic coastal areas like Serra do Bouro. Discover more options on the Running Trails around Caldas Da Rainha guide and the Road Cycling Routes around Caldas Da Rainha guide.
Yes, some natural monuments have historical significance. Mata Rainha Dona Leonor, adjacent to Parque Dom Carlos I, is a historic woodland planted in the 15th century. Serra do Socorro, while primarily geological, also features an 18th-century chapel at its summit and remains of ancient fortified settlements, adding a cultural layer to its natural beauty. The Fonte Pena da Colvina is a historic fountain that once served locals.
Visitors frequently praise the unique contrast at Foz do Arelho Beach, where the calm lagoon meets the Atlantic. Many enjoy climbing the Salir do Porto Dune for the views and even sliding down. The tranquility of spots like the Alvorninha Dam and the urban escape offered by Parque Dom Carlos I are also highly valued. The opportunity for birdwatching and exploring diverse ecosystems is a significant draw for nature enthusiasts.
Yes, there is a natural monument known for Dinosaur Footprints. However, visitors note that finding the exact location and identifying the tracks can be challenging and may require some imagination, as it's not a highly developed tourist attraction with extensive signage.
The Óbidos Lagoon is Portugal's largest saltwater lagoon, famous for its unique ecosystem and the distinctive dual-sided beach at Foz do Arelho Beach. It's a vital habitat for migratory birds, a popular spot for various watersports like kayaking and windsurfing, and offers serene landscapes for walking and nature appreciation.


Extend your search for the best caves by checking out these guides of the top ones around Caldas Da Rainha: