Question: The Little Powder River is a tributary of the Powder River, in southeastern Montana and northeastern Wyoming, it drains an area historically known as the Powder River Country, is the Powder River Basin area of the Great Plains in northeastern Wyoming, in which country?
Sentence (from "Little Powder River"): It drains an area historically known as the Powder River Country on the high plains east of the Bighorn Mountains.
Relevant evidence: No