With more than a thousand kilometres of shoreline, Lake Alqueva has plenty of places to get into the water. Beaches that are equipped and lifeguarded are far fewer — in 2026 there are six with a Blue Flag — and that's the distinction that matters when you're deciding where to take the family.
The difference between a beach and a place to swim
A licensed lake beach has defined season dates, lifeguards over part of the sand, regular water-quality testing, changing rooms and usually parking.
A place to swim is a stretch of shore where you can get in. It may be beautiful and quiet, but there's no supervision, no facilities, and the bottom shifts with the reservoir level.
The distinction matters most with children and with anyone who isn't a strong swimmer. It's also why it's worth knowing which beaches are actually certified — they aren't always the ones that come up first in a search.
The six Blue Flag beaches in 2026
| Beach | Municipality | Sand | From Mourão |
|---|---|---|---|
| Amieira | Portel | ~600 m, ~150 lifeguarded | 40 min |
| Mourão | Mourão | 320 m, 100 lifeguarded | 10 min |
| Monsaraz | Reguengos de Monsaraz | — | 22 min |
| Alqueva | Portel | ~150 m | 54 min |
| Azenhas d'El Rei | Alandroal | — | 46 min |
| Praia do Lago | Moura | — | 51 min |
Drive times are from Mourão by real routing. Where the sand length is blank, we couldn't find a figure published by an official source — and we'd rather leave it out than invent one.
Amieira — the largest
Around 600 metres of sand, roughly 150 of them lifeguarded, which makes it the largest lake beach in the Alentejo. It has a Blue Flag, a lawn, a bar and restaurant, and sits beside the Amieira Marina — the lake's main nautical centre and the departure point for most houseboats.
It's the obvious choice if you want to combine a beach day with a boat trip. It's on the far side of the lake from Mourão: 40 minutes by car, because you have to go around.
Mourão — the best equipped
320 metres of sand, 100 of them lifeguarded, on an island reached by a wooden boardwalk. It holds a Blue Flag, and in 2026 added a Gold Quality classification and Accessible Beach status.
Beyond the sand: a lawn with around 45 free parasols, an enclosed floating pool for children, a platform with a diving tower and a slide, changing rooms, a picnic area with barbecues, and a ramp into the water with an amphibious chair.
It isn't the biggest, but it has the most on it — and it asks the least of anyone arriving with children. On 13 June 2026 this was where the first Blue Flag of the year for an inland beach in Portugal was raised, at a national ceremony marking 40 years of the programme.
Full guide to Mourão lake beach →
Monsaraz — the one with the view
On the slope below the walled village, facing the lake. It has a Blue Flag and lifeguards through the season, with a bar and restaurant.
The draw isn't the sand: it's the combination. Morning in the water, lunch at the beach bar, then up to Monsaraz for sunset — one of the best in the region, with the whole lake below you. 22 minutes from Mourão.
Alqueva — the one at the dam
In the village of Alqueva, beside the dam wall, in Portel. Around 150 metres of sand, with a bar, a terrace and supervision through the season.
It's small and quiet. It makes sense combined with a visit to the dam itself, which is worth seeing up close — but it's 54 minutes from Mourão, which makes it a full day out rather than a quick swim.
Azenhas d'El Rei — the northern arm
At Capelins, in Alandroal, on the lake's northern arm. It has a Blue Flag and a picnic area, and its season has been among the longest — in recent years from 1 June to 30 September.
It's the quietest of the six. 46 minutes from Mourão, and mostly a beach for people staying near Alandroal or Redondo.
Praia do Lago, Moura — the newest
The most recent of the six, at the Moura nautical centre, opened in June 2024. It has a Blue Flag and floating pools, which is what sets it apart.
51 minutes from Mourão, at the southern end of the lake, in the Beja district.
Which to pick
With small children: Mourão. The enclosed floating pool and the free parasols make a disproportionate difference on an August day.
For a full day: Amieira. More space, more sand, and the marina next door for a boat trip in the late afternoon.
If you only have an afternoon: whichever is closest to where you're staying. The distances between them are real — the lake is 250 km² — and it isn't worth crossing it to gain a hundred metres of sand.
If you want a beach and a view: Monsaraz, and stay for sunset.
When to go
The bathing season at Alqueva generally runs from mid-June to mid-September, varying by municipality. Outside those dates the beaches remain accessible, but with no lifeguards and nothing open.
The lake warms considerably in summer — in August it's comfortable, often above 25°C, far warmer than the Atlantic. September is the best month: the water holds its heat and the crowds have gone.
Before heading to a beach you don't know, check that year's season dates with the local council. They change.
What to bring
Flip-flops or water shoes help — the bottom isn't always sand. A hat and serious sunscreen, because natural shade is scarce at all of them. And if you're going to Mourão, don't bother with a parasol: the ones on the lawn are free.
Common questions
Which is the largest lake beach on Lake Alqueva?
Amieira, in the municipality of Portel, with around 600 metres of sand — about 150 of them lifeguarded. It is the largest lake beach in the Alentejo. Mourão comes next with 320 metres, but has more facilities.
How many Alqueva beaches have a Blue Flag?
In 2026 there are six on the main lake: Mourão, Monsaraz (Reguengos), Amieira and Alqueva (Portel), Azenhas d'El Rei (Alandroal) and Praia do Lago (Moura). The list is published each year by the ABAAE and can change.
Is the water at Alqueva warm?
In summer, yes. It's one of the reasons these beaches differ from the Atlantic coast: reservoir water warms through the summer and by August is considerably warmer than the sea. September is usually the best month — the water holds its heat and there are far fewer people.
When is the bathing season at Alqueva?
It varies by beach and by year, but generally runs from mid-June to mid-September. Some open in early June and close on 30 September. Exact dates are published by each town council. Outside the season the beaches are still accessible, but with no lifeguard and no facilities open.
Which Alqueva beach is best with children?
Mourão. It has an enclosed floating pool, a lifeguarded stretch of sand, free parasols on the lawn, changing rooms and a shaded picnic area. It needs the least preparation and the least supervision.
