Final answer:
The mouth of a river refers to the point where it flows into another body of water, not necessarily the lowest elevation.
Step-by-step explanation:
The statement that 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 actually refers to the point where the river flows into another body of water, such as a lake, sea, or ocean. It is typically found at the lowest point of elevation along the river's course. For example, the mouth of the Mississippi River is located at the Gulf of Mexico.
Learn more about River mouths