His cousin, Sir Alexander Mackenzie, followed the North Saskatchewan River to its northernmost point near Edmonton, then setting northward on foot, trekked to the Athabasca River, which he followed to Lake Athabasca.
Hans kusin, sir Alexander Mackenzie, följde North Saskatchewan River till dess nordligaste punkt nära Edmonton, och fortsatte sedan norrut till fots till Athabascafloden, som han följde till Athabascasjön.