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| GeographicArea | 1292 | A geographic location, generally having definite boundaries. Note that this differs from its immedi... | ^ |
| WaterArea | 96 | A body which is made up predominantly of water, e.g. rivers, lakes, oceans, etc. | ^ |
| SurfZone | . | The WaterArea off the Shoreline where waves break. | ^ |
| Harbor | 1 | Harbor is the subclass of WaterAreas that provide shelter and anchorage for WaterVehicle. | ^ |
| Anchorage | 1 | Anchorage is the subclass of WaterAreas where WaterVehicle may anchor with some shelter or sa... | ^ |
| ShipBerth | . | ShipBerth is the class of areas where a Ship may be moored, whether at an Anchorage or dock. | ^ |
| StreamWaterArea | 8 | A relatively narrow WaterArea where the water flows constantly and in the same direction, e.g. a ... | ^ |
| StaticWaterArea | 1 | A WaterArea in which water does not flow constantly or in the same direction, e.g. most lakes and... | ^ |
| SaltWaterArea | 48 | A WaterArea whose Water is saline, e.g. oceans and seas. | ^ |
| FreshWaterArea | 6 | A WaterArea whose Water is not saline, e.g. most rivers and lakes. | ^ |
| HydropowerWaterArea | . | HydropowerWaterArea is the class of WaterAreas with waterflow strength adequate for the product... | ^ |
| BodyOfWater | 55 | A BodyOfWater is a connected body of water with established boundaries marked by either geographi... | ^ |
| WaterCurrent | 5 | WaterCurrent is a subclass of FlowRegions consisting of moving water, especially those currents... | ^ |
| InlandWaterSystem | . | An instance of InlandWaterSystem comprises two or more lakes or rivers, canals, or other waterway... | ^ |
| StreamWaterConfluence | . | A StreamWaterConfluence is the place where a stream or other tributary joins a river. | ^ |
| RiverSystem | . | A RiverSystem comprises all the tributary streams and rivers (StreamWaterAreas) that drain alon... | ^ |
| Waterway | 11 | Waterway is the class of navigable waters, including Oceans, SeaLanes, Rivers, Canals, ... | ^ |
| RiverMouth | . | RiverMouth is the subclass of WaterAreas that are the outfalls of a river or stream into anothe... | ^ |
