In late September 1820, hoping to lay claim to territory then under dispute between Great Britain and the United States, Governor William King of the newly founded state of Maine dispatched Major Joseph Treat to survey public lands on the Penobscot and Saint John Rivers. Traveling well beyond the limits of colonial settlement, Treat relied heavily on the cultural knowledge and expertise of John Neptune, lieutenant governor of the Penobscot tribe, to guide him across the Wabanaki homeland. Along the way Treat recorded his daily experiences in a journal and drew detailed maps, documenting...