The United States is indeed a land o' lakes. Expect a moderate score on today's quiz, as it may prove difficult for all but the most seasoned geography buffs. Your goal? Name as many of the 20 largest U.S. lakes as you can in seven minutes. Natural, artificial, saltwater, freshwater, doesn't matter. We're just looking for the ones that cover the most area.

We left out the word "lake" and "sea" from each entry for convenience's sake. The timer starts when you enter your first guess. Any score of 10 or better, we feel, is a very good score. (And don't forget the obvious ones.) Good luck!