You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "where is the allegheny river located on a map?" whose answer is Eastern United States.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Allegheny River location map
Useful Output:

Doc 1: Map of the Allegheny River, Pennsylvania, U.S.A.  The Allegheny River catchment (shaded) and the study area (box) are delineated in the inset map.
Doc 2: Title. A map of the Alleghany, Monongahela, and Yohiogany rivers. Names. Wightman, Thomas. Harris, Thaddeus Mason, 1768-1842. Created / Published.
Doc 3: The Allegheny starts in Pennsylvania, near Cobb Hill, meanders into New York into Cattaraugus County, near Salamanca, before heading back into Pennsylvania
Doc 4: Map of Allegheny River  The Allegheny River /ælɨˈɡeɪni/ is a principal tributary of the Ohio River; it is located in the Eastern United States. The Allegheny
Doc 5: Allegheny River, river rising in the hilly plateau region of Potter county, Pennsylvania, US, and flowing generally northward for about 80 miles (130 km).