Gazmin was a planet that was completely covered by water. There were absolutely no landmasses above the surface. The planet was populated by aquatic Gaz, who built cities under the ocean in the form of metallic underwater bases.
There were many underwater volcanoes, mountains and trenches under Gazmin's waters. However, the pressure would crush anyone without a pressure neutralizer. Fish and coral reefs were abundant on Gazmin, most of the ocean floor was covered in kelp.