Final answer:
Macnab's Line is the boundary line between eastern and western Canada, named after Sir Allan MacNab.
Step-by-step explanation:
Macnab's Line refers to the boundary line between two land masses or territories. It is named after Sir Allan MacNab, a Canadian politician, and is specifically used to determine the border between eastern and western Canada.
The line is a way to visually represent the division between the eastern and western parts of the country, and it serves as a useful landmark to identify and distinguish between different regions of Canada.
Example: The Macnab's Line runs roughly parallel to the Great Lakes and separates the province of Ontario from the western provinces and territories of Canada.