Which landform would be the most logical place to build a canal to connect two large bodies of water?

Building a canal to connect two large bodies of water is most logically associated with a strait. A strait is a narrow body of water that connects two larger water bodies, and the construction of a canal in such an area would facilitate navigation and transportation between these waters.

In contrast, a river is typically a flowing body of freshwater that may not serve as an ideal starting point for a canal, as it usually has its own natural flow and course. A lake is a standing body of water that could serve as a terminus or source for a canal but does not inherently provide a connection between two separate water bodies. A reservoir is an artificial lake, primarily created for water storage and management, and while it could potentially be part of a canal system, it does not inherently offer the direct linking benefits of a strait. Therefore, the optimal scenario for canal construction is found in a strait, emphasizing the importance of geographical and hydrological connectivity.