Lakes around Alcáçovas are primarily artificial lakes and reservoirs, with the region being part of the wider Alentejo, home to the Great Alqueva Lake, one of Europe's largest artificial lakes. The area is characterized by a Mediterranean-like climate and a landscape featuring small islands and peninsulas. These bodies of water are significant for agriculture, electricity production, and offer various outdoor activities. The region also holds historical and cultural interest with nearby villages and castles.
Last updated: July 1, 2026
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The Pego do Altar Dam, originally named Salazar Dam, is a dam built on the bed of the Ribeira das Alcáçovas, in the Sado River basin, in the parish of Santa Susana, in the municipality of Alcácer do Sal, Portugal. The Salazar Dam was built in 1949, during the Estado Novo period, to harness the waters for agriculture in the Sado Valley (rice fields of Alcácer do Sal) and for hydroelectric generation. Its reservoir is now a point of great tourist interest, particularly for sport fishing.
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The Pego do Altar Dam, originally named Salazar Dam, is a dam built on the bed of the Ribeira das Alcáçovas, in the Sado River basin, in the parish of Santa Susana, in the municipality of Alcácer do Sal, Portugal.[1] The then Salazar Dam was built in 1949, during the Estado Novo period, to harness the waters for agriculture in the Sado Valley (rice fields of Alcácer do Sal) and for hydroelectric generation. Its reservoir is now a point of great tourist interest, particularly for sport fishing.
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The Pego do Altar Dam is located a few kilometres from Alcácer do Sal and was built in 1949 to supply the agricultural area of the Sado River valley and to produce electricity. Today it is very popular with foreigners in their motorhomes and with sports fishing enthusiasts. It is a magical place due to its landscapes, its capacity for leisure activities and its importance in irrigating the fields, where the main irrigated crop is rice. Not far from the Pego do Altar Dam, the village of Santa Susana has a curious feature: some buildings with modernist architecture from the 1940s, which are due to a benefactor of the region, Henrique Louro Fernandes, whose monogram (HF) can be found on some of them. A small church, with two 16th-century panels inside, somewhat deteriorated but magnificent, completes the interesting visit to this place. Recently, the drought that hit this area “uncovered” an old 200-year-old bridge that was submerged by the waters of the dam.
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The Pego do Altar Dam is located a few kilometres from Alcácer do Sal and was built in 1949 to supply the agricultural area of the Sado River valley and to produce electricity. Today it is very popular with foreigners in their motorhomes and with sports fishing enthusiasts. It is a magical place due to its landscapes, its capacity for leisure activities and its importance in irrigating the fields, where the main irrigated crop is rice. Not far from the Pego do Altar Dam, the village of Santa Susana has a curious feature: some buildings with modernist architecture from the 1940s, which are due to a benefactor of the region, Henrique Louro Fernandes, whose monogram (HF) can be found on some of them. A small church, with two 16th-century panels inside, somewhat deteriorated but magnificent, completes the interesting visit to this place. Recently, the drought that hit this area “uncovered” an old 200-year-old bridge that was submerged by the waters of the dam.
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The Vale de Gaio Dam (formerly Trigo de Morais) is a small paradise for hikers and outdoor enthusiasts in general. On its banks, you can find the peace and quiet that characterizes the Alentejo as an excellent eco-tourism destination. Fishing, canoeing, birdwatching or simply walking are obvious and viable options for those who visit us. There is also a guesthouse and picnic areas. Nearby, many rural tourism establishments await your visit. Although it is located in the District of Setubal, Municipality of Alcácer do Sal and Parish of Torrão, this is a gateway to the Central Alentejo, allowing you to easily reach the small whitewashed towns and villages and the golden plains of our Alentejo.
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This is an arm of the Pego do Altar Dam, which serves to irrigate the rice fields in the Alcácer do Sal area.
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The lakes around Alcáçovas are primarily artificial lakes and reservoirs, crucial for irrigation and hydroelectric generation in the region. These include significant dams like Pego do Altar Dam and Vale de Gaio Dam. The wider Alentejo region is also home to the Great Alqueva Lake, one of Europe's largest artificial lakes.
You can enjoy a variety of activities. At Vale de Gaio Dam, visitors can go fishing, canoeing, and birdwatching. Pego do Altar Dam is popular for sports fishing and is a favored spot for motorhomes. The Great Alqueva Lake, a regional highlight, offers extensive water sports like sailing, kayaking, paddleboarding, and wakeboarding, along with swimming at various river beaches.
Yes, several lakes are considered family-friendly. The Reservoir of the Pego do Altar Dam is noted as a family-friendly natural monument, offering beautiful landscapes and leisure activities. Vale de Gaio Dam also provides picnic areas and a peaceful environment suitable for families.
The region boasts an enviable natural landscape, characterized by a Mediterranean-like climate. The lakes feature small islands and peninsulas, and are home to diverse fauna and flora. The area around Pego do Altar Dam is known for its magical landscapes, and the Reservoir of the Pego do Altar Dam offers scenic views.
The shores of the Great Alqueva Lake are dotted with historic villages and castles, such as Juromenha, Alandroal, Terena, Monsaraz, Portel, Mourão, and Moura, many offering spectacular viewpoints. Monsaraz, a preserved medieval town, is particularly notable. Near Pego do Altar Dam, the village of Santa Susana features modernist architecture from the 1940s and a small church with 16th-century panels.
Yes, the Great Alqueva Lake region is renowned as one of the best spots for stargazing in Europe. It was the first place in the world to be designated for its stargazing by the Starlight Foundation due to minimal light pollution, with public lighting minimized at night to enhance astronomical observations.
Yes, for those who prefer land-based activities, there are numerous hiking and biking trails around the Great Alqueva Lake. Vale de Gaio Dam is also described as a small paradise for hikers and outdoor enthusiasts, with walking being an obvious and viable option.
The region experiences a Mediterranean-like climate, with warm, dry conditions for most of the year. This makes it suitable for outdoor activities and water sports for a significant portion of the year. For specific activities like hiking, spring and autumn offer milder temperatures.
Yes, birdwatching is a recommended activity, particularly at Vale de Gaio Dam, which offers a peaceful environment characteristic of the Alentejo, making it an excellent eco-tourism destination for observing local birdlife.
Recently, due to drought conditions, an old 200-year-old bridge that was submerged by the waters of the Pego do Altar Dam was uncovered, offering a unique glimpse into the area's past.
Visitors appreciate the peace and quiet, especially at places like Vale de Gaio Dam, which embodies the tranquil character of the Alentejo. The scenic landscapes, opportunities for various leisure activities, and the historical significance of the dams are also highly valued.
Near Vale de Gaio Dam, you can find a guesthouse and picnic areas, with many rural tourism establishments nearby. The Great Alqueva Lake also has infrastructure at its river beaches, and the surrounding villages offer various amenities.


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