Steven glanced at me, then poked at the image. "Well, I see a transportation system right there. Vacuum monorail or something similar. That would be your long-distance travel option. I love the river concept. Artificial current, of course, since there’s no downhill along the length. I suppose you could raise one end of the river in each segment and pump the water upward, but then you have issues of topography. Even a one-tenth percent grade for this implementation would mean a half-mile elevation at the headwaters. And moving all that mass up and down would create issues of angular momentum." He paused, then pointed. "The hollow mountains every five hundred miles or so would be where your maintenance and infrastructure would be—"