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| WaterArea | 106 | A body which is made up predominantly of water, e.g. rivers, lakes, oceans, etc. | ^ |
| SelfConnectedObject | 2976 | A SelfConnectedObject is any Object that does not consist of two or more disconnected parts. | ^ |
| BodyOfWater | 58 | A BodyOfWater is a connected body of water with established boundaries marked by either geographi... | ^ |
| Ocean | 5 | Ocean is the class containing the oceans that are the major subdivisions of the WorldOcean. Acc... | ^ |
| Sea | 8 | Sea is the class of smaller subdivisions of the WorldOcean, typically partially surrounded by l... | ^ |
| LandlockedWater | 13 | LandlockedWater includes water areas that are surrounded by land, including salt lakes, fresh wat... | ^ |
| Gulf | 6 | Gulf is the class of extensions of a Sea or Ocean that reach into a land mass or are partiall... | ^ |
| Estuary | . | Estuary is the subclass of BodyOfWater that represents WaterAreas where a sea or ocean Tide... | ^ |
| Inlet | 4 | Inlet is the class of bays or other recesses into the shore of a lake, sea, or river, includes ... | ^ |
| Sound | . | A Sound is a long, relatively narrow waterway lying along the shore of a land mass and protected ... | ^ |
| Strait | 2 | Strait is the subclass of BodyOfWater that consists of narrow water areas connecting two larger b... | ^ |
| Channel | . | A Channel is a narrow deep waterway connecting two larger bodies of water. May be natural or dred... | ^ |
| River | 3 | River is the class of large streams of fresh water flowing through land into a lake, ocean, or ot... | ^ |
| Creek | . | Creek is the class of small streams of fresh water flowing through land, usually into a River. | ^ |
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