The geographic opposite of a peninsula is an island. A peninsula is a landform that is surrounded by water on three sides but connected to a larger landmass on the fourth side. In contrast, an island is completely surrounded by water and is not connected to any larger landmass.
Here’s a brief explanation of the options:
- a. A river: A river is a body of water that flows, usually into a larger body of water. It is not the opposite of a peninsula.
- b. A deep inlet: A deep inlet is a narrow body of water that extends into the land. It is not the opposite of a peninsula.
- c. A pond: A pond is a small body of still water. It is not the opposite of a peninsula.
- d. An island: An island is completely surrounded by water and is not connected to any larger landmass, making it the geographic opposite of a peninsula.
Therefore, the correct answer is d. an island.