Amariah is curious when storytime becomes actually-figuring-out-what-to-do-with-harpies time, but she can give it a while. She sticks with Cam while they trace the shoreline. The topography is weird but it doesn't shift; distances in multiple directions don't add up right but tracing the same sequence of movements always leads to the same landmarks, same shore features. The shades exist on an island, judging by what happens when the shore is flown along. Estimating its size is futile, of course.