Refers to the riverside or riverine environment next to the stream channel (Riley, Ann (1998). Restoring Streams in Cities: a guide for planners, policy makers and citizens. Island Press, Washington, D.C. p. 408). Riparian areas may have distinctly different vegetative species than adjacent areas, and/or, species similar to adjacent areas but exhibiting more vigorous or robust growth forms. These areas are transitional zones between wetland and upland. (Federal Interagency Stream Restoration Working Group (1998). Stream Corridor Restoration: Principles, Processes and Practices. p. 2-61).