The Cascada de la Cola del Caballo - the "horsetail waterfall" - is one of the wonders of the Ordesa and Monte Perdido National Park. It takes around three hours to reach the falls by means of a route beginning at the Pradera de Ordesa, overshadowed by the giant wall Tozal del Gallinera, at the end of the tarmacked road. The trail runs along the right bank of the Arazas River and into the lush green valley, where pines, beech and fir trees rise above an undergrowth of box. Along the trail we pass the smaller falls of el Abanico (the fan), Arripas, la Cueva (the cave), el Estrecho (the narrow one) and the Gradas de Soaso (the Soaso steps). Finally we reach the great Cola de Caballo, a wide block fall that cascades down the rock wall at the head of the valley and the foot of the Cilindro, Monte Perdido and Soun de Ramond peaks. One of Nature's most impressive shows.