Avi clicks again, superimposing transparent blue over the parts that are below sea level, green on the islands. Then he zooms in on an area in the center of the map, where the Philippine plateau extends two arms southwest toward northern Borneo, embracing, and nearly enclosing, a diamond-shaped body of water, three hundred and fifty miles across. "The Sulu Sea," he announces. "No relation to the token Asian on Star Trek ."