Tallest Mountain is a location. To find him, you must figure out between him and the other two mountains. He has a watermelon patch. In his patch you can pick as many tasty watermelons as you want. You can also climb him, too. But be careful. Since he's a wobbly mountain, don't stomp on him, or his watermelon patch. He thinks it's painful and his watermelons might roll at you. So whatever you do, treat this mountain nicely.