Best lakes around Seia, nestled in Portugal's Serra da Estrela mountains, features a landscape rich with natural and engineered water bodies. This region is characterized by its high-altitude reservoirs, glacial valleys, and unique geological formations. Visitors can explore a variety of lakes and river beaches, providing opportunities for outdoor activities and scenic views. The area combines natural beauty with notable engineering feats, making it a distinctive destination for those seeking mountain and water experiences.
Last updated: June 17, 2026
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Covão dos Conchos is an artificial lagoon located in the Serra da Estrela Natural Park, Portugal, near the mountain village of Sabugueiro. Covão dos Conchos became famous for its bell-mouth spillway[1]. The spillway was built in 1955 to allow water to be transferred from the Ribeira das Naves River to Lagoa Comprida. It is part of the Serra da Estrela Hydroelectric System. This science fiction-style spillway became famous when photographs of the hole went viral on social media in 2016. Over the past 60 years, the growth of vegetation at the funnel's mouth has created extraordinary biodiversity and increased its ethereal allure. It is 4.6 meters high and 48 meters in circumference. The tunnel that collects the water is 1,519 meters long.
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Located within the Planalto Superior biogenetic reserve, the Rossim Valley is a unique location of great scientific, environmental, and scenic value that deserves to be protected and enhanced. Although it is an artificial lake, over time, conditions have been created that have transformed this area into an excellent leisure and recreation area that attracts countless tourists. The Vale do Rossim recreation center is located at an average altitude of 1,437 meters. Before the dam was built, it was one of the best high-altitude pastures in the municipality of Gouveia. The area has almost always been frequented by transhumance herds, flocks that gathered here from São João to the Sr. do Calvário festivities in August.
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At over 1,400 meters above sea level, the Rossim Valley Reservoir is a haven of granite, pine trees, and crystal-clear waters in the heart of the Serra da Estrela Mountains. It's the perfect setting for strolls, summer swims, and admiring nature in all its splendor, one of Portugal's highest jewels.
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Hiking in the Serra da Estrela is always pleasant, with stunning scenery and spectacular trails. 👍
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This restaurant and bar is located right on the lake (there's nothing else in the area), and it's nice to sip a nice beer 🍺 and grab a bite to eat after a sunny day or a nice hike. Also... For those who want to stay longer, there's the Vale do Rossim Eco Resort: camping, equipped yurts, or wooden cabins, with the option of half-board at a reasonable price at this lakeside restaurant. Breakfast is good, dinner is very simple, but all drinks are included, including a bottle of wine 🍷 🤪.
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A beautiful nature trail, about 9 km round trip to Covão dos Conchos. Unfortunately, on August 15th, the water couldn't reach the hole and thus reveal the waterfalls. It's a reservoir, part of the Serra da Estrela hydroelectric system. A funnel-shaped drainage structure that allows water to flow from this body of water to Lagoa Comprida. The spillway was built in 1955 to divert water from Ribeira das Naves to Lagoa Comprida. Over the past 60 years, moss and foliage have grown over the mouth of the funnel, creating a captivating spectacle. It is 4.6 meters high and 4.8 meters in circumference. The tunnel that collects the water is 1,519 meters long. It's a stunning place to visit, not only for the combination of human intervention and nature, but also for the surrounding landscape.
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Located at an altitude of approximately 1,600 meters, Lagoa Comprida is the largest water reservoir in the Serra da Estrela, intended for hydroelectric generation. This natural lake lies in a wide depression of glacial origin, approximately one kilometer long, which fed the Covão Grande glacier. Numerous glacial scars are visible along its banks, making this lake one of the most interesting geomorphological sites in the Serra da Estrela. Construction on this lake began in 1911, and by 1914, it was already six meters high. Later, in 1965, it underwent heightening work that increased its height to 28 meters, currently boasting a storage capacity of approximately 14 cubic hectometers, flooding an area of approximately 80 hectares. Small streams of water flow into this lagoon, as well as water retained in the Covões dos Conchos and Covões do Meio and carried to this lagoon through underground tunnels.
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We walked this walk in October, on a beautiful day, after a few days of heavy rain. Due to the previous wet days, parts of the path were quite a challenge. Certainly to keep your feet dry. The advantage was that the water flowed nicely into the 'drain'. Beautiful sight and impressive. Due to the path of pebbles, boulders, unevenness, etc., it is advisable to wear good walking shoes. Take enough food and drink with you, as is always the advice. In sunny weather, protection from the sun is absolutely necessary. There is no protection from the sun during the walk. Walk calmly, enjoy the surroundings and let everything sink in.
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The region is home to several unique features. One notable example is Covão dos Conchos Trail, famous for its distinctive bell-mouth spillway that looks like a natural sinkhole but is an impressive feat of engineering diverting water to Lagoa Comprida. You can also visit Long Lake, the largest reservoir in Serra da Estrela, which lies in a wide depression of glacial origin, showcasing numerous glacial scars along its banks.
Yes, there are several spots for refreshing swims. While not a lake, Loriga River Beach, located in a glacial valley near Seia, offers pure, crystal-clear waters and amenities during the swimming season. Additionally, Vale do Rossim Reservoir is known for its crystal-clear waters, making it a popular spot for summer swims. You can also find a bathing pool at Poço da Broca de Serapitel, an incredibly beautiful waterfall.
The area offers a variety of hiking trails. The hike to Covão dos Conchos Trail often starts from Lagoa Comprida and is around 10 km long, offering magnificent landscapes. Vale do Rossim Reservoir also serves as a starting point for hiking tours. For more options, you can explore various routes in the region, such as the 'Caniça Trail' or the 'Serra da Estrela Levada – Aqueduct of the Caniça Route', which are part of the Hiking around Seia guide.
The best time to visit depends on your preferred activities. For swimming and enjoying amenities at river beaches, summer is ideal. If you wish to see the water flowing strongly into the Covão dos Conchos spillway, visiting after a period of heavy rain, often in autumn or winter, can be spectacular. However, be prepared for potentially challenging path conditions during wet seasons. The landscapes are magnificent year-round, with spring offering lush greenery and autumn showcasing vibrant colors.
Yes, several spots are great for families. Vale do Rossim Reservoir is considered family-friendly, offering strolls and opportunities to admire nature. Loriga River Beach provides amenities like a café, lifeguard services, and restrooms during the swimming season, making it suitable for families. The Covão dos Conchos Trail is generally easy, though some rocky areas require good shoes.
Near Vale do Rossim Reservoir, you'll find the Vale do Rossim River Beach Restaurant, which is a great spot to refuel after a hike or swim. This area also offers accommodation options like camping, equipped yurts, or wooden cabins at the Vale do Rossim Eco Resort. In the wider Seia region, you can find various cafes, pubs, and accommodation options.
Many of the lakes in Serra da Estrela, such as Long Lake (Lagoa Comprida), have a glacial origin. They lie in wide depressions carved by ancient glaciers, with numerous glacial scars visible along their banks. This makes them geomorphologically interesting sites, showcasing the powerful forces that shaped the mountain landscape.
Absolutely. The region around Seia offers various routes for mountain biking and running. For mountain biking, you can find trails like the 'Covão do Curral Lagoon – Lagoa Comprida Dam loop'. For running, options include the 'Covão dos Conchos loop' from Albufeira de Lagoa Comprida. You can find more detailed routes in the MTB Trails around Seia and Running Trails around Seia guides.
Long Lake (Lagoa Comprida) was originally a natural glacial lake. Its enlargement into the largest reservoir in Serra da Estrela involved a significant dam construction project that began in 1911. The dam was later heightened in 1965 to its current 28 meters, increasing its storage capacity for hydroelectric generation. This project took nearly half a century due to the challenging mountain conditions.
Visitors frequently praise the stunning landscapes, the fresh mountain air, and the unique blend of natural beauty with impressive engineering. The opportunity for nature walks, photography, and the refreshing swims in crystal-clear waters are highly valued. Many also enjoy the tranquility and the chance to disconnect in the heart of the Serra da Estrela mountains.
Yes, for easier walks, the areas around Vale do Rossim Reservoir are ideal for gentle strolls and admiring nature. While the Covão dos Conchos Trail is generally considered easy, some sections have loose stones, so good footwear is recommended. Many paths around the larger reservoirs offer relatively flat sections perfect for leisurely walks.
While direct public transport to some of the higher-altitude lakes can be limited, especially outside peak season, Seia itself is accessible by public transport. From Seia, local services or taxis might be available to reach closer points of interest. For more remote locations like Lagoa Comprida or Covão dos Conchos, driving or joining organized tours is often the most convenient option.


Still not found your perfect lake around Seia? Check out the guides of these regions to see even more beautiful places.