アレンケルの天然記念物・トップ14

The area of the springs, on the Ota River, was once a leisure area for the local population, including the local bathing area in the summer. This site remained natural for a long time after the EPAL was installed, but at a certain point, the intensification of agriculture with the use of chemical fertilizers and pesticides, intensive livestock farming, and urban sewage made the flow from upstream a polluting threat to EPAL's water intakes, and EPAL paved several dozen meters of the river course near the site where it is installed with reinforced concrete.

“Paul Natura”, Manique do Intendente https://www.youtube.com/watch?v=9nKhlLvOrJw

Forte da Archeira, part of the Lines of Towers defensive north of Lisbon during the Peninsular War, is a military fortification located at an altitude of 345 m. It was part of the 1st Defensive Line with the forts of Catefica and Feiteira. Despite not having gunboats, it has traces of a magazine. It forms part of the Lines of Torres, a system of 152 fortifications extending over 80 km, built between 1809 and 1812 to prevent the advance of Napoleonic troops.

The Serra de Montejunto Forest Watch Station can be accessed via a pastoral trail from the picnic park. It offers a beautiful panorama of the region north of the Serra.

The Ota River has its source in the Montejunto mountain range. It flows through the Ota area and empties into the Alenquer River, which in turn meets the Tagus River near Vila Nova da Rainha. At this point the river is close to the village of the same name, Ota.

Forte da Archeira, part of the Lines of Towers defensive north of Lisbon during the Peninsular War, is a military fortification located at an altitude of 345 m. It was part of the 1st Defensive Line with the forts of Catefica and Feiteira. Despite not having gunboats, it has traces of a magazine. It forms part of the Lines of Torres, a system of 152 fortifications stretching over 80 km, built between 1809 and 1812 to prevent the advance of Napoleonic troops.

The Serra de Montejunto Forest Watch Station can be accessed via a pastoral trail from the picnic park. It offers a beautiful panorama of the region north of the Serra.

The karst landscape of Montejunto constitutes the extreme southwest of the Estremenho Limestone Massif. Deep valleys, lakes, gravel pits and lapiás are some of the formations found here, testimonies of various geological eras. Water has been the protagonist in erosion phenomena over time. Several deposits of gravel pits result from the cracking of the outcrops caused by the expansion of the water which, when freezing, breaks the rock into small parts. Source: https://montejunto.pt/natureza/paisagens/