Explore hiking trails around Arrens-Marsous, Midi-Pyrénées. The best hike near Arrens-Marsous is Cascada Cola de Caballo Loop via Senda de Los Cazadores and Senda a la Cola de Caballo, a 11.7 mile loop in Parque Nacional Ordesa y Monte Perdido. Arrens-Marsous has population 700.0.