| superclass | description |
|---|---|
| Landform | A landform or physical feature. Landform elements include mountains, plains, lakes, rivers, seascape and oceanic waterbody interface features such as bays, peninsulas, seas and so forth, including sub-aqueous terrain features such as submersed mountain ranges, volcanoes, and the great ocean basins. |
| subclass | description |
|---|---|
| Canal | A canal, like the Panama Canal. |
| LakeBodyOfWater | A lake (for example, Lake Pontrachain). |
| OceanBodyOfWater | An ocean (for example, the Pacific). |
| Pond | A pond. |
| Reservoir | A reservoir of water, typically an artificially created lake, like the Lake Kariba reservoir. |
| RiverBodyOfWater | A river (for example, the broad majestic Shannon). |
| SeaBodyOfWater | A sea (for example, the Caspian sea). |
| Waterfall | A waterfall, like Niagara. |