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A tributary (or confluent/affluent) is a stream or river which flows into another river (a parent river) or body of water but which may not flow directly into the sea. Source:
For references, please go to www.eea.europa.eu/soer or scan the QR code.
This briefing is part of the EEA's report The European Environment - State and Outlook 2015. The EEA is an official agency of the EU, tasked with providing information on Europe's environment.
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