Rio da Mula Reservoir - Quinta de Porto Covo - Quinta do Pisão

This roughly 10 km (6.2 mi) route with about 200 m (656 ft) of climbing is a varied circuit on the southern side of the Serra de Sintra, linking the Rio da Mula reservoir area with the rural landscapes of Quinta de Porto Covo and Quinta do Pisão inside the Sintra-Cascais Natural Park. Expect a medium-difficulty outing rather than a technical one: the elevation gain is moderate, but the route can feel harder after rain because forest tracks may turn muddy, roots become slick, and fallen branches sometimes obstruct sections of trail. Recent hiker reports have also noted occasional windfall on nearby routes in this area. (alltrails.com)

The most practical trailhead reference is Quinta do Pisão de Cima, Estrada EN9-1, at the junction for Barragem do Rio da Mula, Alcabideche, Cascais, Portugal. That is the clearest nearby known address published for access to this walking area, and it sits beside the approach to the reservoir. Quinta do Pisão’s published location is at EN9-1 / Estrada da Serra, crossroads for the Rio da Mula reservoir, with coordinates around 38.758752, -9.419183. (cascais.pt)

By car from Lisbon, the usual approach is via the A5 or N6 toward Malveira da Serra, then follow signs for Lagoa Azul and continue along Estrada da Serra / EN9-1 to the entrance area. From Sintra or IC19, the standard approach is via Arco do Ramalhão, then the N9, turning toward Lagoa Azul and continuing on Estrada da Serra. Parking is available at Quinta do Pisão, though motor vehicles are only permitted in the car park area. By public transport, the M44 bus from Cascais Estação (Largo) serves Quinta do Pisão and Barragem do Rio da Mula, with a journey time of about 35 minutes; schedules shown in the source indicate service throughout the week, but it is wise to verify the latest departure times before setting out. (ambiente.cascais.pt)

What the route feels like

The walk begins in a landscape shaped by both water and old estate land use. Near the reservoir, the terrain is broad and open in places, then narrows into woodland and farm-track corridors as the route bends toward Porto Covo and the interior of Quinta do Pisão. The first part is usually the gentlest, letting hikers settle into the rhythm of the day on wide tracks with gradual undulations rather than immediate steep climbing. Around the reservoir and connecting paths, the scenery alternates between still water, low scrub, pasture, and denser forest cover. (360.cascais.pt)

As the route progresses, the climbing tends to come in short to moderate rises rather than one sustained ascent. With only around 200 m (656 ft) of total gain over 10 km (6.2 mi), most hikers will find the effort manageable, but the route is long enough that footwear and pacing matter. A reasonable expectation is: - 0 to 2 km (0 to 1.2 mi): easy warm-up terrain near the reservoir access and estate tracks
- 2 to 6 km (1.2 to 3.7 mi): the most varied section, with woodland, rural features, and rolling elevation changes
- 6 to 10 km (3.7 to 6.2 mi): a mix of open and sheltered paths returning through the Quinta do Pisão landscape, where fatigue can make even gentle rises feel more noticeable

Because this is a natural park route rather than an urban promenade, surfaces can vary from compact dirt and gravel to softer, uneven ground. After wet weather, expect puddles, mud, and slippery patches, especially in shaded forest sections. (alltrails.com)

Landmarks, landscape, and wildlife

The standout landmark is the Barragem do Rio da Mula area, a quiet reservoir setting that forms a natural gateway into this part of the park. From there, the route moves through a mosaic of habitats created by the meeting of old agricultural land, pasture, watercourses, and the lower slopes of the Serra de Sintra. Quinta do Pisão is specifically described by Cascais as an agro-silvo-pastoral landscape, meaning hikers should expect a countryside shaped by farming, grazing, woodland management, and conservation rather than untouched wilderness. (360.cascais.pt