When a River flows into the sea, where does the freshwater end and where does the salt water start?
In: Biology
They meet in estuaries that have what is considered brackish water. It has a lower salt content than sea water but more than the fresh river water.
Estuaries are important ecosystems for many animals such as birds and fish along with many more.
[check this out](https://en.m.wikipedia.org/wiki/Estuary)
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