One of the most relevant issues in the growing (social and institutional) identification of the environment, nature and rural regions is the creation of protected areas.This is held to be an important aspect in the conception of the countryside as an environmental reserve. As a consequence of the processes of industrialization and urbanization which have dominated modern societies in recent decades, as well as from global socio-economic transformation, considerable parts of European rural areas (mainly the southern ones and particularly the Portuguese ones) could essentially be considered as marginal spaces or agricultural areas of low income and productivity.This situation led the majority of Mediterranean countries and some peripheral areas of more central countries in the European Union (from the 1970s onwards) to respond to the pressures and recommendations of international agencies, scientific bodies and of society as a whole in order to convert remote rural areas into spaces for environmental and natural conservation and protection. Despite having some advantages, instituting rural spaces into environmental and natural conservation areas can also present important constraints. In this article we will discuss some problems in the conversion of Portuguese rural areas, as well as consequences for the future of rural regions in Portugal.