Which river's name is derived from a Scottish explorer?

The correct answer is the Mackenzie River, named after the Scottish explorer Sir Alexander Mackenzie. He was the first recorded individual to successfully cross North America from east to west, reaching the Pacific Ocean in 1793. His explorations were significant in mapping the Canadian wilderness and understanding the geography of the region. This river is the longest in Canada, flowing through the Northwest Territories and playing a crucial role in the area's ecosystem and Indigenous cultures.

Other rivers like the Missouri, Snake, and Ohio have different origins for their names. The Missouri River, for instance, is named after the Native American Missouria tribe. The Snake River is derived from the Shoshone name for the river, which refers to the many twists and turns it takes. The Ohio River's name comes from the Iroquois word "Ohi:yo," meaning "great river." Therefore, the Mackenzie River stands out as having a name that specifically honors an individual explorer from Scotland.