Is the Caribbean Sea salt water?

Yes, the Caribbean Sea is salt water. It is part of the Atlantic Ocean and has an average salinity of around 36 parts per thousand. This means that for every thousand grams of seawater, there are about 36 grams of dissolved salts, mostly sodium chloride (common salt). The salinity of the Caribbean Sea can vary slightly from place to place and over time due to factors such as rainfall, evaporation, and freshwater input from rivers and streams.