Oceanography

Oceanum spans the entire world. Although the winds are mild at sea level compared to the tempests at altitude, they gather force for thousands of miles, and along with the tremendous ocean-crossing waves, make sailing upon the surface a hazardous affair. The skies above Oceanum are often no better, with great turbulent masses of clouds tossing even the largest Castela about. The only regular travelers across Oceanus are the mysterious Submersible Urbs, such as Waterdeep.