River
| Basic: |
| A river is a type of watercourse. |
| Documentation: |
| Comment: A specialization of Stream . Each instance of #$River is a natural stream of water, normally of a large volume. Instances of #$River include the ColoradoRiverOfArizona, the AmazonRiver, the YangtzeRiver, and the ThamesRiver . <p> For smaller streams, see Creek. |
| Structure: |
| Every oxbow lake is a physical part of some river. |
| Size: |
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| Miscellaneous: |
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| For every riverbank there is exactly one X such that X is a river and the riverbank borders on X. Every river borders on some riverbank. If some riverbank is a riverbank and that riverbank is on the side of some watercourse, then that watercourse must be a river. For every right riverbank and left riverbank there is exactly one X such that X is a river and X is on the side of the right riverbank and the left riverbank. Every left riverbank and every right riverbank are on the side of one river. |
| The Little Bighorn River ends in a river. Some river starts from a drainage basins. |