Which of the following is not a natural topographic feature?

Canals are human-made structures designed to manage water flow, facilitate navigation, or provide irrigation, which distinguishes them from natural topographic features. Natural topographic features are those formed by natural processes without direct human intervention.

Rivers, for example, are waterways that naturally carve out landscapes over time through erosion and sediment deposition. Foliages, while they may appear to be part of the landscape, refer to the leaves and branches of plants that grow naturally in environments. Hills are naturally occurring elevated landforms created through geological processes such as folding, faulting, and volcanic activity.

In summary, while rivers, foliages, and hills are all natural features shaped by the Earth’s processes, canals are artificial constructions that do not fit within this definition, making them the correct response to the question.