Answer:
The Appalachian Mountains
Explanation:
The Appalachian Mountains was the border which determined boundaries of the southern and middle. Roughly formed around 460-480 million years ago.
The geographical feature that determined the western boundaries of the Southern and Middle colonies is the Appalachian Mountains.
In the context of geography and geographic information science, a feature is a discrete phenomenon that occurs at a specific point in the relevant geographic space and scale, i.e., at or near the Earth's surface, at a moderate to global scale.
Features including elevation, slope, orientation, stratification, rock exposure, and soil type are used to categorise landforms. These features consist of berms, mounds, hills, cliffs, valleys, rivers, and many others.
The highest-order landforms are the oceans and continents. The four main types of landforms are plains, plateaus, mountains, and hills. However, buttes, canyons, valleys, and basins are minor landforms.
Thus, the Appalachian Mountains can be determined as a geographical feature.
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