The estauries are characterized by mix of fresh water and salt water. That is option A
Estauries is defined as the part of water where many rivers meet and sweep into the ocean.
The characteristics of estauries include the following;
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Which feature is characteristics of estauries:
A mix of fresh water and salt water.
swap-like land.
region of land that drains into a body of water.
the gradient of salinity in a semi-enclosed coastal system.