Water that has a high salt concentration is termed "saline water" or "saltwater." This type of water is primarily found in oceans and seas, constituting about 97% of the Earth's water supply. The salinity of saltwater is generally around 35 parts per thousand, which means that for every liter of seawater, approximately 35 grams of salt are dissolved. Saltwater supports a variety of marine ecosystems, fostering diverse flora and fauna, including fish, coral reefs, and sea mammals. In contrast, freshwater is defined as having low salt concentrations and is found in rivers, lakes, and aquifers, supporting different ecosystems.