Joseph Canyon (Nez Perce: an-an-a-soc-um, meaning "long, rough canyon"[1]) is a 2,000-foot (610 m)-deep basalt canyon in northern Wallowa County, Oregon, and southern Asotin County, Washington, United States.
- ^ Sambur, Jeff (1 January 2007). "On the Trail of the Nez Perce:Searching for the Promised Land". Native Peoples Magazine. Archived from the original on 13 May 2008. Retrieved 17 March 2008.