argüello biosphere reserve. declared by unesco in 2005, the argüellos biosphere reserve is an area of special value, not only b

asturias betula biodiversity brushwood bush cantabrian conservation craggy ecosystem environment flowers forest heather heathers highlands image landscape leon mixed mountain mountainous mountains national natural nature outdoor park pass plant rainbow reserve rugged rural scenery scenic scrub shrub shrubland space spain spring steep tourism travel tree unesco valle valley vegetation