“The Great Probability of a North West Passage Deduced from Observations on the Letter of Admiral de Fonte” is a historically significant work that explores the possibility of a Northwest Passage. The author's identity remains anonymous, but the book offers a thought-provoking analysis based on observations of Admiral de Fonte's letter. This publication adds to the historical discourse on the search for the Northwest Passage and its potential impact on exploration and navigation. It is a valuable resource for those interested in maritime history, geographical exploration, and the quest for uncharted routes.