Short answer:
When fresh water meets salt water and they mix, the result is brackish water. (See related questions.)
An estuary may be formed when this occurs at the mouth of a river. (See related link.)
More:
An estuary is a partially enclosed area where a fresh water source such as a river flows into a salt water body such as a sea or ocean. The area is termed an estuary if both ocean and salt water influxes substantially determine the nature of the body of water, hence it would normally be partially enclosed and retaining a significant portion of fresh water influx that is not immediately diluted into the seawater.
Estuaries are often both interesting biological systems and interesting geological formations.
Note: For the more general question of where fresh and salt water meet, see related questions.
Note: If one is interested in the halocline, which is a strong vertical gradient of salt concentration form sometimes at the interface of fresh water and salt water, then that is a different question.
They meet at the ocean, the salt water will go up stream but not far
At its mouth
It is called a Delta
Estuary.
estuary
an estuary
Estuaries
An estuary is a place where fresh water meets ocean water.
Delta
There are three types of water. Freshwater, Saltwater, and brackish water. When Fresh water meets salt water is makes brackish water.
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the answer is estuary
The Mouth Of the River
Water that is a mixture of fresh water and salt water is called brackish water.
The point where a stream or river meets the ocean is known as an estuary. Estuaries are dynamic ecosystems where freshwater and saltwater mix, creating a unique habitat that supports diverse marine and plant life. These areas are important for providing nurseries for fish and other marine species.
The Arctic Ocean is saltwater as are all oceans.
The Atlantic Ocean contains salt water. It contains approximately 3% salt.