Photographer David Clifford has captured the world's most dogged runners doing what they love in the most remote and unforgiving environments.
The Saint Lawrence river, Quebec
The Saint Lawrence River passes through Quebec, Ontario and New York and connects the Great Lakes with the Atlantic Ocean. A whopping 744 miles (1197 km) long, it originates at the outflow of Lake Oregon before draining into the St Lawrence estuary, which is one of the largest estuaries in the world. Popular cruise stop-offs include Fort Wellington and Upper Canada Village, which is regarded as a living museum community, since it is home to many buildings which have been moved here from flooded areas.
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