The _______ is the largest lake in the world by surface area.
- Lake Superior
- Caspian Sea
- Lake Victoria
- Lake Baikal
Answer: Caspian Sea
The Caspian Sea is the largest lake in the world by surface area (371,000 sq km), though it is called a 'sea' due to its size and salinity. It is landlocked, bordered by Russia, Kazakhstan, Turkmenistan, Iran, and Azerbaijan. Lake Baikal is the deepest and holds the most freshwater.