This book tells the story of two remarkable missionary journeys undertaken in 1783 and 1785 to explore the uncharted wilds of the Southern Andes. The author, a Franciscan missionary, set out with a group of companions to investigate the possibility of establishing a route over the formidable mountain range to reach the other side of the continent. Their perilous journey took them through dense forests, across raging rivers, and up treacherous slopes, all while navigating the dangers of the wilderness and the ever-present threat of inclement weather. Along the way, they encountered fascinating indigenous tribes and relics from the mysterious civilizations that had inhabited the region centuries before. The author's vivid account of their experiences and detailed descriptions of the geography and natural history he encountered provide a unique insight into one of the most isolated and pristine regions on Earth at the time.