From the look of it, the Chesapeake Pod is basically a few of the more northern southern states, and most of the mid-atlantic region. It really doesn't have much to do with the Chesapeake Bay, but referring to it as the Chesapeake Pod is more specific-sounding than the "Atlantic Pod" or the "Mid-Atlantic Pod" or the "Not New England but Not The South Pod." Pods are designed to be reasonable get-together zones, meaning that you belong in whichever pod you think would be most convenient to attend a meet-up. For most people in the Mid-Atlantic States, thanks to the huge metropolitan region that connects New York to Philadelphia to Wilmington to Atlantic City to Baltimore to even D.C., it is pretty easy to get to those cities using highways, trains, etc.