OK, I did a little research, I would never have guessed your lake. So I won't mention the name yet. What's your source by the way?

Hmmm, we might have a disagreement here. My sources say Lake Baikal in Siberia has more water, about 4,500,000 cubic metres more than yours.

List of lakes by volume - Wikipedia, the free encyclopedia

Largest Lake in the World - Largest in the United States - GEOLOGY.COM