DCHP-1 Online
council bluff Hist. 
a natural elevation, such as a hill or bluff (def. 2), on the prairie, affording a vantage point for an encampment of Indians holding pow-wows, looking for herds of buffalo, etc.
See also: bluff (def. 2)
- 1856 (1923) Had I judged of things by the lively conversation and cheerful countenances I saw on the little council bluff [where the buffalo hunters were encamped], I had been greatly deceived indeed. . . .
- 1856 (1923) Had I judged of things by the lively conversation and cheerful countenances I saw on the little council bluff [where the buffalo hunters were encamped], I had been greatly deceived indeed. . . .