In Guns, Germs, and Steel, Jerod Diamond makes an interesting observation about peninsulas: the landform, much like an island, isolates a people. Peninsulas act as a force multiplier, granting a space easier defense, so that a polity might survive invasion by a much more powerful culture. (Think: Hot Gates and Isthmus of Corinth.) Conversely, a spit can bring the closed-culture [...]
