Crossing the Mackenzie River on the free ferry. The Mackenzie - Deh Cho (big river in the Dene language) - is the largest river system in Canada. The main river flows 1,738 kilometres (1,080 miles) from Great Slave Lake to the Beaufort Sea, dropping just 156 metres (512 feet) in that distance.

This photograph is © 2011 by Murray Lundberg, and is not to be copied without express permission.