Simplify the following text for a Grade 4 native English-speaking person.
Original: With a surface area of 68800 k , Lake Victoria is Africaâ s largest lake by area , and it is the largest tropical lake in the world . Lake Victoria is the world 's second largest freshwater lake by surface area ( Only Lake Superior in North America is larger . )
Simplified: It is Africa 's largest lake , and the second largest fresh water lake in the world .