- Source: place where a river begins.
- Confluence: point where a river joins a larger one.
- Estuary: part of the river mouth that is tidal.
- Delta: a fan-shaped area of land found at the mouth of a river.
- Mouth: place where the river enters the sea.
- River basin: the land that water flows across or under on its way to a river.
- Flood plain: area that gets covered with water when the river floods.
- Tributary: a stream or river that joins a larger river.