“Inland waters” are aquatic-influenced environments located within land boundaries. This includes those located in coastal areas, even where adjacent to marine environments. Inland water systems can be fresh, saline or a mix of the two (brackishwater). Terminology can confuse: inland water bodies include the Caspian Sea (freshwater) and the Dead Sea (hyper-saline), whereas the Baltic Sea (also largely freshwater) would be excluded by some.