Best natural monuments around Caldas Da Rainha (Nossa Senhora Do Pópulo) offer diverse natural landscapes, from coastal lagoons to inland parks and unique geological formations. The region features areas where the Óbidos Lagoon meets the Atlantic Ocean, alongside protected woodlands and urban green spaces. These natural areas provide ecological importance and recreational opportunities for visitors. The municipality encompasses significant natural features, including extensive dunes and rock arches.
Last updated: May 18, 2026
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Óbidos Lagoon is the largest coastal lagoon system in Portugal, located in the district of Leiria, about 85 km from Lisbon. It is a fragile ecosystem and a popular destination for those seeking tranquility, nature and nautical activities, connecting the towns of Óbidos and Caldas da Rainha.
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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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This place is accessible by gravel and not with a road bike.
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It is located in a shallow depression with irregular and very unstable contours near the sea, whose natural barrier separating it from the marine environment is formed by a line of coastal dunes. It is connected to the sea by a channel of variable width and positioning, locally known as "open". Sometimes this transition point closes, requiring interventions to keep the bar open. It is a lagoon system of enormous ecological importance. The Óbidos Lagoon is the largest coastal lagoon system on the Portuguese coast. It has a total area of approximately 6.9 km2 and an average depth of two metres, with elevations ranging from half a metre to five metres. It extends upstream essentially by two channels, to the west by the Braço do Bom Sucesso, and to the east by the Braço da Barrosa. (Source: Wikipedia)
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The coast is spectacular and there are some paths leading next to the coastal cliffs. It's beautiful there!
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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 region boasts diverse natural features. You can visit the impressive Penedo Furado Rock Arch, a geological formation from the Jurassic period with a passage formed by erosion. Another unique spot is the Salir do Porto Dune, one of Portugal's highest sand dunes, offering great views where the Tornada river meets the sea. Additionally, the Arnóia River, which flows into the Óbidos Lagoon, provides a serene natural setting.
Yes, several natural monuments are great for families. Foz do Arelho Beach is particularly suitable, offering both ocean waves and the calm, shallow waters of the Óbidos Lagoon, which is very safe for children. The Salir do Porto Dune is also a hit, with visitors enjoying climbing and sliding down the sand. Parque Dom Carlos I, while an urban park, offers a lake with rowboats and plenty of space for picnics, making it a pleasant family outing.
The area offers a variety of outdoor activities. You can enjoy water sports like kayaking and paddleboarding in the Lagoa de Óbidos. For cycling enthusiasts, there are numerous routes, including road cycling options like the "Foz do Arelho Beach – Sapo Bordallo Pinheiro loop" from Caldas da Rainha. Mountain biking trails are also available, such as the "Ponta da Lagoa de Óbidos – View over the Lagoa de Óbidos loop." For hikers, easy trails like the "Penedo Furado Rock Arch – Foz do Arelho Beach loop" are popular.
Yes, some natural areas have historical significance. The Mata Rainha Dona Leonor, adjacent to Parque Dom Carlos I, is a 17-hectare woodland planted in the 15th century. Its original purpose was to protect the thermal springs supplying the historic Queen Leonor Thermal Hospital, making it one of Portugal's first planned green areas. The Penedo Furado Rock Arch itself is a natural monument dating back to the Jurassic period, offering a glimpse into ancient geological history.
The region's natural monuments can be enjoyed year-round, but the best time often depends on your interests. For birdwatching, particularly at Lagoa de Óbidos, autumn and winter are ideal when migratory birds are present. Spring and early autumn offer pleasant temperatures for hiking and exploring without the peak summer heat. Summer is perfect for beach activities at Foz do Arelho Beach and water sports in the lagoon.
Yes, the Lagoa de Óbidos is a significant sanctuary for various aquatic species and migratory birds. It provides critical habitats for endangered species such as the osprey and marsh harrier, making it an excellent spot for birdwatching. The tranquil waters of the lagoon are home to swans and ducks, especially visible in Parque Dom Carlos I.
Absolutely. The Salir do Porto Dune offers expansive views of the coastline and the mouth of the Tornada river. Additionally, the View of the Coastal Cliffs provides spectacular vistas of the dramatic Atlantic coastline, with paths leading alongside the cliffs for breathtaking panoramas.
Visitors particularly enjoy the diverse landscapes and recreational opportunities. Many appreciate the unique combination of ocean and lagoon at Foz do Arelho Beach, which is great for both swimming and relaxing. The sheer size and views from the Salir do Porto Dune are also a highlight, with some enjoying sliding down it. The tranquil atmosphere of Parque Dom Carlos I and the ecological richness of Lagoa de Óbidos are also frequently praised.
Yes, Parque Dom Carlos I, located in the heart of Caldas da Rainha, is a significant urban green space. Designed in 1889, this romantic park features a serene lake, scenic walkways, and diverse flora. Adjacent to it is the Mata Rainha Dona Leonor, a 17-hectare woodland that serves as a crucial green lung within the city, offering marked trails for walks and exercise.
Parque Dom Carlos I, being an urban park, features a charming café terrace right by its lake, perfect for refreshments during your visit. For coastal natural monuments like Foz do Arelho Beach, you'll find various cafes and restaurants along the promenade, offering convenient options for a meal or a drink with a view.
Yes, there are easy hiking options available. For example, the "Penedo Furado Rock Arch – Foz do Arelho Beach loop" is an easy 5.3 km route that allows you to explore both the unique rock formation and the beautiful coastal area. The Mata Rainha Dona Leonor also offers marked trails suitable for leisurely walks.
In summer, light and breathable clothing is recommended. If you plan to visit coastal areas like Foz do Arelho Beach or the Salir do Porto Dune, swimwear, a hat, sunglasses, and sunscreen are essential. Comfortable walking shoes are advisable for exploring trails and parks. Even on sunny days, a light jacket might be useful for cooler evenings or coastal breezes.


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