According to Groupon:
Each U.S. state has a distinctive shape, and it's important to have each shape memorized so you can tell when you are entering it. Here's a look at the shapes of the best-shaped states:
Colorado: This state is shaped like a square, with the four 90-degree angles representing the four 90-year-old co-governors on the state's Ruling Council of Power.
Montana: Is shaped like a perfect rectangle whose left side is throwing up on Idaho
Nevada: Has no set shape, since its southern border is formed by an undulating 200-foot-high wall of moaning seaweed that no man dares penetrate
New Mexico: Shaped like two mating starfish
Maine: The creation of the fantasy novelist Francis Crawford Holmes, this imaginary state is said to be shaped like a stag's antlers and located in the hearts of all curious children.