Which among the following is not a source of fresh water?

Fresh water is water that is not salty and is safe for human consumption and other uses. It makes up a small fraction of the total amount of water on Earth and is essential for the survival of all living organisms. Fresh water can be found in surface water sources such as rivers, lakes, and streams, and in groundwater sources such as aquifers.

The oceans belong to the category of saltwater. Saltwater contains dissolved salts and minerals, making it unsuitable for drinking or irrigation without treatment.