The Polaris Sea is Zeno's most prominant body of water. It is over the size of two Earth diameters. The Polaris Sea holds billions of marine life within it, including gargantuan sea predators such as Levialodons and Greaters. One of Zeno's most populated cities, Abaddon, is located underneath the Polaris Sea. The Industrial District, countless other underwater cities, and thousands of platform cities can also be found within the Polaris Sea's radius.