The difference between 'water' and 'waters'

Water is the liquid that forms the seas, rivers, and wells. We also drink it to quench our thirst.
The following sentence shows the usage of this word.

The travellers drank river water when he was very thirsty.

On the other hand, waters is an area of sea regarded as under thr juristiction of a particular country.

The sentence below shows how 'waters' is used.

Our government cannot do anything when the pirates are in international waters.