The walkways are part of a larger environmental conservation strategy to prevent erosion on the shifting sandstone and limestone cliffs.
The Foz do Arelho lagoon is a rare example of a complex estuary system that remains connected to the ocean throughout the year.
On clear days, the walkways provide a line-of-sight view to the Berlengas Nature Reserve, a UNESCO Biosphere Reserve located 10 kilometers offshore.
The area is a documented habitat for various migratory waterbirds that utilize the transition zone between the fresh lagoon water and the saline Atlantic surf.
The Passadiços da Foz do Arelho consist of elevated wooden walkways running along the cliffs of the northern coast of the Óbidos Lagoon. The structure offers a continuous path between the beach area and the cliff tops, providing a vantage point overlooking the meeting of the Atlantic Ocean and the lagoon. The walkways are designed to protect the fragile cliff vegetation and dune ecosystems from human foot traffic. The route features integrated viewpoints with panoramic vistas of the coastline and the Berlengas archipelago in the distance. The wooden construction is periodically maintained due to the high-salinity maritime environment and wind exposure. It is a popular location for birdwatching, particularly for species habituated to the lagoon's marshy environment. The walkways directly connect the Foz do Arelho beachfront to the scenic coastal trail network. It serves as a primary access point for hikers exploring the northern cliffs of Caldas da Rainha.
The highest observation deck looking southward toward the sandbar where the lagoon meets the ocean.
Wear wind-resistant clothing as the exposed cliff tops experience strong, consistent Atlantic breezes.
Bring binoculars to utilize the designated observation points for better views of the lagoon's birdlife.
Walk the entire length for shifting perspectives of the lagoon inlet's dynamic sandbar.
Avoid attempting to descend the cliff face directly from the walkways; use only marked staircase access points to the beach.
Stay on the wooden slats at all times to protect the underlying cliff-side flora; keep pets on a leash.
