Saline water is a term used to describe water that has a high salt concentration. There are many synonyms for saline water, which include brackish water, brine, saltwater, seawater, and salt solution. Brackish water is water that has a mixture of salt and fresh water. It is usually found where freshwater and seawater meet, such as river mouths or estuaries. Brine is a highly concentrated salt solution used in pickling and preserving. Saltwater refers to any water that contains salt, while seawater is specifically water found in the ocean. Salt solution is any liquid that has salt dissolved in it. These synonyms are all used to describe water with varying degrees of salt concentration.