Praia Fluvial do Lago Azul (Castanheira)

Lago Azul, which means “blue lake”, is the name everyone uses for the Praia Fluvial da Castanheira, a beach on the Castelo do Bode reservoir in the municipality of Ferreira do Zêzere, Santarém district. The council’s tourism site calls it one of the biggest attractions in the area, thanks to its clear water and its floating pool. The APA (the Portuguese Environment Agency) describes it as a beach in forest, with a floating pool and room for water sports such as kayaks, pedal boats (gaivotas) and windsurfing.

Castelo do Bode is a huge reservoir on the River Zêzere, held back by a dam downstream near Tomar. The water here is still, with no river current, and both tourism boards describe it as crystal clear.

In 2026 Lago Azul was nominated for the public vote for River Beach of the Year, run by the Guia das Praias Fluviais.

The floating pool (piscina flutuante) is the thing that makes Lago Azul work for families with small children. It’s a framed pool that floats on the reservoir, so you swim in lake water inside a contained space. According to the council’s equipment page, there are two:

• Main pool: 15 metres long, 6 metres wide and 1.60 metres deep. Most children can’t touch the bottom, so this one is for confident swimmers.
• Children’s pool: 5 metres by 2 metres and only 50 centimetres deep. That’s a proper toddler paddling depth, with sides to hold on to.

Use is free. The council page dates from 2017, so check the layout on the day, but the floating pool is still listed as the main feature by the council’s tourism site and by the APA in 2026.

You can also swim from the shore. Reservoir water deepens away from the edge, so keep small children in the children’s pool or right beside you.

For children who need more than a swim, Lago Azul has water sports. Turismo Centro de Portugal says wakeboarding is the most popular activity here, and describes a cable park in a sheltered bay next to the Clube Náutico do Lago Azul. A cable park tows riders round a course on an overhead cable rather than behind a boat, and the tourism board says it runs all year for beginners and experienced riders. Bookings go through Wakeboard Portugal.

The council’s tourism site lists the Clube Náutico do Lago Azul for water-skiing, wakeboarding and boat hire. The Médio Tejo tourism board also mentions windsurfing, sailing, jet skis, kayaks, pedal boats, canoeing and fishing. We couldn’t find published prices or minimum ages for any of these, so contact the operators before you promise a teenager a session.

Watching the wakeboarders from the shore costs nothing.

The official bathing season ran from 13 June to 13 September 2026, with a lifeguard on duty. The APA classes the water as Excellent, recorded no short-term pollution in 2025 and sees no significant pollution sources nearby. It tests every two weeks in season. There’s also a live MEO beach webcam, linked from the APA’s InfoÁgua page, which is handy for checking how busy it is before you set off.

Lago Azul does not have a Blue Flag in 2026. Outside the season nobody watches the water, and the floating pools are in open water, so treat any out-of-season swim with extra care.

The APA lists toilets, beach support and parking. The Médio Tejo tourism board adds a bar, a restaurant, a first-aid post, the lifeguard and access for people with disabilities. The APA doesn’t list showers.

The winter of 2025 to 2026 was hard on Lago Azul. After storm Kristin, landslips on the slope above the Estrada da Castanheira cut the main paved road to the beach, and in March 2026 the government’s tourism secretary visited to see the damage. Ferreira do Zêzere council tarred the Estrada do Maxial so there was still an alternative way in. In August 2026 the council put the stabilisation of the slope and the repair of the road out to tender, at a base price of €363,141 and with 150 days of work planned, so expect roadworks into 2027.

In practice, follow local signs and allow extra time. Drive, as we couldn’t find public transport to the beach.

• The road access is disrupted until the Estrada da Castanheira is repaired.
• The main floating pool is 1.60 m deep, too deep for most children.
• Boats and jet skis are part of the scene, so it’s not the quietest spot on the reservoir.
• Reservoir levels change, and the council notes the altitude of the floating pool varies with the level of the dam.

Tomar is the nearest town with plenty for children: the Pegões aqueduct is a giant stone water bridge you can walk beside, and there’s a skate park and municipal pools. Across the reservoir in Vila de Rei, Fernandaires has another floating pool and a Blue Flag. For a flowing river, the Agroal near Ourém has spring water in a limestone gorge, and Aldeia do Mato is another Castelo do Bode beach on the Abrantes side.

Is Lago Azul good for toddlers?

Yes, thanks to the floating children’s pool, which the council gives as 5 m by 2 m and 50 cm deep. Stay beside them: the rest of the reservoir is deep.

Is there a lifeguard at Lago Azul?

Yes, during the 2026 bathing season from 13 June to 13 September.

Can children try wakeboarding?

There’s a cable park next to the Clube Náutico do Lago Azul, and the regional tourism board says it caters for beginners. Ask the operator about minimum ages and prices before you go.

Is the road to Lago Azul open?

The main road was cut by landslips in early 2026, and an alternative road (Estrada do Maxial) was tarred to keep access open. Repairs to the main road were put out to tender in August 2026.

Is it free?

The beach and floating pools are free. Water sports, the bar and the restaurant cost extra.

Is there food?

The tourism board lists a bar and a restaurant. You can also bring a picnic.