What is brackish water and where does it occur?
Brackish water is water which is a mixture of freshwater and seawater, and is often found in bays or estuaries
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What is brackish water and where does it occur?
### Input: 
### Response: Brackish water is water which is a mixture of freshwater and seawater, and is often found in bays or estuaries