Ordesa Park actually comprises three separate valleys emanating out of Monte Perdido, "the lost mountain." The park's namesake, the Ordesa Valley, is renowned -- and deserves to be. Carved out by glaciers, the valley is outlined by limestone folds brilliantly marked with bands of gray, red and yellow ochre. Unlike most valleys in the Pyrenees, the Ordesa runs east/west. Since it is open to the west, the valley gets lots of cool, moist air from the Atlantic, making the plantlife lush and the climate moderate. The valley ends in the dramatic Circa Soasa, a glacial cirque.