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Definitions from the Web

Natural Boundaries

Noun:

1. A geographic feature, such as a river, mountain range, or ocean, that naturally marks the limits or borders of a particular area.

Example sentence: The Mississippi River serves as a natural boundary between several states in the United States.

Adjective:

1. Referring to the presence of natural features that define or delimit a specific region.

Example sentence: The natural boundary line between the two countries was marked by a series of towering mountains.

Related Products:

• National Geographic Maps
• Geography Textbook