The largest lake in the world (by area) is:

This question assesses knowledge of global geographical superlatives. The Caspian Sea is the correct answer. It is the world's largest inland body of water by area, often classified as the world's largest lake, spanning approximately 371,000 square kilometers. Its vast size and saline water give it characteristics of both a sea and a lake.

• Lake Superior is the largest freshwater lake in the world by surface area, but smaller than the Caspian Sea overall.
• Lake Victoria is the largest lake in Africa by area and the second-largest freshwater lake in the world by surface area.
• Lake Huron is one of North America's Great Lakes, significantly smaller than the Caspian Sea.

The Caspian Sea's immense size makes it stand out globally.