Wild by Nature: From Siberia to Australia, Three Years Alone in the Wilderness on Foot

Marquis, Sarah: - National Geographic Explorer Sarah Marquis has been profiled in The New York Times Magazine and National Geographic. During the last twenty-three years, Marquis circumnavigated the globe on foot once and then stopped counting. She's been covered for solo expeditions in many countries, such as Australia and South America, and her first long walk was the famous Pacific Crest Trail in the United States.