Sac-Backs live along the "shore", or edge, of the sprawling Amoebic Sea. This periphery is a bleak and inhospitable region, and as the margins of the massive "sea" colony recedes, it has left a flattened landscape, which at one time may have been considered the Amoebic Sea's "floor". It is within these featureless wastes that one may find the Sac-Back, roaming upon awkward, tripodal gait.