Published in multiple parts during the early twentieth century by a joint provincial and federal effort, the Report of the Commission Appointed to Delimit the Boundary Between the Provinces of Alberta and British Columbia documents the grueling topographical expedition tasked with permanently mapping the region's legal borders. The exhaustive technical volumes detail the surveying of the treacherous Rocky Mountain Continental Divide and the 120th meridian, translating high-altitude wilderness into precise trigonometric data, contour maps, and physically erected boundary monuments. Beyond a mere geographic catalog, the commission's multi-year undertaking established the absolute jurisdictional clarity required by both provinces to manage lucrative natural resources, timber rights, and emerging alpine tourism. A keen insight drawn from the work is how the rigorous application of topographical science functioned as a profound mechanism of state enclosure; by mathematically carving a rigid, artificial political barrier across the natural landscape, the Boundary Commission successfully overwrote fluid Indigenous territorial networks with an absolute, permanent geometry of colonial jurisdiction.