Homologated Path - Portuguese Camping and Mountaineering Federation
Route
Set within the Parish of Ortiga, the Ortiga Route offers close contact with agricultural areas, pastureland, and fishing environments—which together form its greatest richness.
Developed in privileged contact with two streams (Boas Eiras, to the south, and Eiras, to the north) and with the Tagus River—the largest river in the Iberian Peninsula—the Ortiga Route is very likely the most scenically rich and diverse trail in the region. Along its course, it subtly touches three distinct regions: Beira Baixa, Ribatejo, and Alentejo.
This is therefore a highly varied route, featuring striking landscapes, largely shaped by the riverside environments of the Tagus Valley. Beyond its natural and cultural diversity, walkers can delight in the ancient testimonies of the Tagus’ origins, its millennia‑old relationship with the communities that settled along its banks, and the perfect symbiosis between river and mountain. Words fall short when trying to describe the deep immersion in the sights and sounds of nature offered by the Tagus.
It is not surprising, therefore, to encounter one of the traditional picaretos—iconic boats that once navigated the Tagus and now stand as a valuable testament to the municipality’s cultural heritage. Encounters with local fishing communities are also possible, reinforcing the importance of a river that urgently needs protection.
Finally, this route is suitable for mountain biking (MTB) and offers several drinking water points (fountains) along its length. In terms of accessibility, Ortiga is served by two railway stops (Ortiga and Belver Dam, both on the Beira Baixa line) and by the A23 motorway (Ortiga–Mação junction).
Natural Heritage
Along the route, walkers can observe beautiful riparian ecosystems composed of tree species such as ash, alder, black poplar, willows, common buckthorn, and elder, among others. On the higher slopes, beyond cork oaks and holm oaks, species such as mastic tree, cornalheira, adelfeira‑bastarda, and tamarisk can also be found.
Special mention should be made of the European orchids and the yellow mountain iris, more precisely the bulbous plant Iris xiphium (Lusitanian subspecies), both rare in this region. As one walks through these landscapes, ancient olive trees are also a constant and striking presence.
The fauna here is exceptionally rich. On land, species range from the otter to the genet, while in the air it is possible to observe birds such as the osprey, European bee‑eater, kingfisher, hoopoe, Eurasian golden oriole, and Eurasian whimbrel, among many others. Notably, five different species of swallows occur in this area: the red‑rumped swallow, house martin, barn swallow, crag martin, and sand martin.
There is more still: sightings of the griffon vulture or even the black stork are possible during the day. At night, walkers may encounter the impressive eagle owl, the discreet tawny owl, the little owl, or the European nightjar and red‑necked nightjar.
In the water, fish such as barbel, boga, and shad inhabit the rivers, although they are harder to spot than the beautiful “aquatic forests” formed by aquatic plants of the genus Potamogeton, visible in several sections of the route.
From a geological perspective, the route features visible folds and ancient river terraces linked to the formation of the Tagus River. Of particular significance are rock outcrops that, in some places, may be around 650 million years old, likely the oldest in the entire municipality of Mação, belonging to the Ossa‑Morena Zone.
Cultural Heritage
This route is exceptionally rich in heritage, spanning periods from Prehistory to the Modern Age. Of note are the ruins of the Vale de Junco Bath Complex, which testify to the intense Roman‑era occupation of this territory, associated not only with agricultural exploitation of the Tagus Valley but also with mineral extraction in the hills of Mação.
Also deserving special attention are the famous, centuries‑old Ortiga fish weirs (pesqueiras), structures built along the banks of the Tagus River to support fishing activities. Without obstructing river navigation, these constructions were designed to alter water flow near the riverbank, creating counter‑currents that attracted fish species during their upstream migration to spawning areas, allowing them to avoid the stronger central current and take advantage of calmer waters.
As a point of interest, along the right bank of the Tagus River, from the mouth of the Rio Frio to the Belver Dam, no fewer than 22 fish weirs can still be identified today, despite their varying states of conservation—an impressive testament to the enduring relationship between the river and local communities.