Final answer:
The mouth of a river is not necessarily located at the lowest possible elevation.
Step-by-step explanation:
The statement 'The mouth of a river refers to the region of a stream located at the lowest possible elevation' is False. The mouth of a river refers to the point where the river empties into a larger body of water, such as a lake or an ocean. It is usually located at a lower elevation compared to the source of the river, but not necessarily the lowest possible elevation.
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