Answer: The coldest water in the ocean is typically found in the deepest regions. The deep ocean is colder than the surface waters because it is far from the sun's warming rays and it is also insulated by the overlying water layers. The temperature of the deep ocean can be as low as just above freezing point (0°C or 32°F).
The areas with the most salt can also have a slightly lower temperature because salt water has a higher density than fresh water, and thus it can retain the cold more than fresh water.
It's important to note that the ocean temperature varies depending on the location, time of the year, and depth. The ocean temperature near the poles is generally colder than the temperature near the equator, and also the ocean temperature near the coast can be affected by the land masses and currents.