A couple of miles from Nauree's cities is the open ocean. The abyssal plain is home to deep-sea razorbacks of mammalian and piscine origin, led by the S-class razorback Leviathan, a 500-foot mutated sperm whale razorback which is one of the six who initially survived the cataclysm and came to rule their razorback brethren. As a result, travel near his immediate viscinity is prohibited, lest they end up in his belly.