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Manitoba from the Air
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The Canada/U.S.A. Border in Ranges 18, 19, and 20WI

The photograph shows the eastern flank of Turtle Mountain that straddles the international border. In Canada much more of the original woodland remains, making it possible for the interpreter to locate the border. In this area, the Cretaceous bedrock is overlain by thick hummocky moraine with numerous hollows many of which are lake-filled. Some of the larger lakes are named on the 1:50,000 topographic map: Beaver Lake 1, Adams Lake 2,Charlton Lake 3, and William Lake 4. The last is the centerpiece of William Lake Provincial Recreational Park, a favourite venue for windsurfers. Lakes appear in various tones ranging from almost black 5, to dark grey (William Lake 4), to light grey (Charlton Lake 3) to almost white 6. The variation from very dark grey to almost white is a result of the relationship of sun angle, water surface and camera angle, with the almost white tone being the result of specular reflection. The variation from very dark grey to light grey is a result of lake depth and sediment content: deeper lakes with little suspended sediment are very dark toned, whereas shallow lakes with suspended sediment are light toned.

North and east of Turtle Mountain the characteristic checkerboard pattern of the DLS system that covers most of southern Manitoba can be clearly seen. Roads follow the section lines of the system 7, but in Turtle Mountain light-toned lines 8 representing access trails are much more haphazard.

PTH 10 9, which continues in some form or another southward to the Gulf of Mexico, crosses the border near the western edge of the photograph. At the border crossing is the International Peace Garden 10 created to recognize the traditional harmony between Canada and the United States. Running diagonally across the north is a long-abandoned railway line 11.

Figure 2.6

The Canada/U.S.A. Border in Ranges 18, 19, and 20WI