Portugal has four reserves in the Azores Archipelago, two in Madeira and six on the mainland, three of which are cross-border.
The first Portuguese Biosphere Reserve, Paul do Boquilobo, was classified in 1981. In 2007, two new Reserves were designated, both in the Autonomous Region of the Azores, Corvo Island and Graciosa Island. The first Transfrontier Reserve, Gerês-Xurês, was approved in 2009, the same year as the Flores Island Reserve. Two years later, in 2011, the Berlengas and Santana Reserves were created. The Meseta Ibérica Transfrontier Reserve (2015), the Fajãs de São Jorge and the Tejo / Tajo Transfrontier Reserves (2016), Castro Verde (2017) and Porto Santo (2020) were soon added.
In 2021, 283,960 people lived in the Reserves, 3 per cent of the total resident population in Portugal, having lost around 40 per cent of their residents in the last 60 years.
Of the 25,800 villages in Portugal, around 1,800 (7%) are located in Biosphere Reserves.