Mysterious Underwater River Found on Ocean Floor | Brine Pools A brine pool, also known as a brine lake or underwater brine pool, is a concentrated area of highly saline water that exists on the ocean floor. These pools are typically found in deep ocean basins and are characterized by their high salinity, which can be several times greater than that of the surrounding seawater. Brine pools are formed when certain geological and chemical conditions are met. One famous example of a brine pool is t