Sir Alexander Mackenzie, a Scottish explorer, is known for his remarkable contributions to exploration and cartography. He is credited with discovering the Mackenzie River, which is the longest river in Canada, and reaching the Pacific Ocean via an overland route. Other synonyms for Sir Alexander Mackenzie include foremost Scottish explorer, pioneer cartographer, and adventurer of the Canadian wilderness. He also holds the distinction of being the first European to travel from the Atlantic Ocean to the Pacific Ocean across the mainland of North America. Sir Alexander Mackenzie is a celebrated figure in Canadian history and is often regarded as one of the country's most inspiring explorers.