Associação Transumância e Natureza (ATN) is a non profit environmental NGO, created in 2000, at Figueira de Castelo Rodrigo, Guarda District, in the northeastern part of Portugal.
The name comes from an international foudation (Transhumance and Nature Foundation), which was one of the founders. The name is a reference to the extinct activity of transhumance - an old tradition of shepherds, who conducted the herds of sheep a long way, in order to take advantage of pasture land at different altitudes and times of the year.
ATN was created on the 6th of June of 2000, and has its office at Figueira de Castelo Rodrigo (Guarda, Portugal). Owning aroung 800 hectare of land at the Côa Valley, ATN is the manager of the Faia Brava Reserve, the first private protected area in Portugal, located inside the Côa Valley SPA (Natura 2000) and the Côa Archaeological Park (UNESCO World Heritage Site). ATN owns and manages several other reserves in the Northeast of Portugal and is the Portuguese local partner of the Rewilding Europe iniciative.