Tallest Mountain is a location. To find her, you must figure out between her and the other two mountains. She has a watermelon patch. In his patch you can pick as many tasty watermelons as you want. You can also climb her, too. But be careful. Since she's a very ticklish mountain, don't walk to roughly on her. If she laughs, and she will, her watermelons might roll at you, so whatever you do, walk cautiously please!