line runs along the zone’s southern edge; north of the zone lies the astounding vastness of the Northern Arctic.

Glaciers retreated from this area almost 9000 years ago, but still remaining are the scratch marks of the rocks that they slowly dragged across the Precambrian bedrock. Reminders of the glaciers can also be seen in the many lakes of the zone, in its extensive moraine deposits of boulders and rocks, and in the eskers that meander across the landscape – narrow, twisting ridges of gravel and sand (some as long as 100 kilometres) left behind by ancient sub-glacial streams.

Today’s streams and rivers have also left their mark on this region of plains and rolling uplands. The Hornaday, Brock and Roscoe Rivers, for example, which flow north through Tuktut Nogait National Park to Amundsen Gulf, have carved deep gorges and canyons out of the sedimentary bedrock of this area. Wilberforce Falls, on the Hood River, has a