Mt Cotopaxi is the highest active volcano in Ecuador and one of the highest in the world.
BBC: Scaling the Ecuadorean Andes
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Cotopaxi, with its white cone brilliant against the blue sky, he found the most beautiful of all.
NPR: Excerpt: 'Natives and Exotics'
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Outfitters in Quito, about 75km south of Cotopaxi, offer all manner of Cotopaxi climbs, often combined with mountain biking, horse riding and hiking or camping in the park.