The Mississippi River formed the western boundary.
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A natural boundary that is not a body of water could be formed by physical features such as mountains, deserts, or forests. These features act as barriers and define the limits of a region or country.
A natural boundary is a boundary created by natural features like rivers, mountains, or lakes. A physical boundary is a wider category that encompasses both natural boundaries and artificial boundaries created by humans, such as walls or fences.
Natural boundaries can include landforms like rivers, mountains, and oceans that divide territories or regions. These boundaries are formed by natural features of the Earth's landscape and can be used to separate countries, states, or other geographical areas.
A tectonic boundary, such as a mountain range or a deep ocean trench, can divide continents. These boundaries are formed by the movement of tectonic plates and can create physical barriers between landmasses.
The physical feature that formed the northeast boundary of Asoka's empire was the Himalayan mountain range.