I came across this attractive powerpoint in English celebrating the importance of black poplar in forming the landscape in the southern Aragon. The valleys are scattered with traditional pollards which look glorious especially in spring. From Ancient Tree Forum. From the book El chopo cabecero en el sur de Aragon, la identitad de un paisaje. Patrimonio olvidado‘ by Chabier de Jaime Loren and Fernando Herrero Loma.