Lake Powell, Arizona
Lake Powell is big. I mean, incredibly big. Bigger, even, than the biggest thing you can imagine. It's rather large, is what I'm trying to say. To give you a rough idea of the scale of Lake Powell, I'd like to point you at the Western shoreline of the contiguous United States - you know, that wiggly bit of coast that stretches all the way from Tijuana on the Mexican border to Canada 1293 miles further North. In fact, let's throw in the entire coastline of Hawaii ...