The Anta da Estria is a megalithic dolmen situated between Belas and Queluz in the Lisbon District of Portugal.

It was almost destroyed by construction in the 1990s of Portugal’s A9 motorway but was eventually incorporated into the landscaped area of a service station for that highway, facilitating easy access.

Later excavations carried out by what is now the Portuguese Institute of Architectural and Archaeological Heritage (IPPAR), of the Direção-Geral do Património Cultural (Directorate-General for Cultural Heritage), under the direction of Ana Carvalho Dias have shown the corridor to make use of a pre-existing inclined depression in the rock.

[5] Limited artifacts have been discovered at the site but many are thought to have been removed prior to the discovery by Ribeiro.

While human remains were found, Ribeiro did not feel confident to identify the number of burials that had taken place at the tomb, which he had done for the Anta do Monte Abraão.