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: "How long is the river that bounds the Mid-Continent Region on the west?" whose answer is 2341 mi.
Each document should contain about 30 words, and these documents should contain useful information.

Query: length of the mississippi river
Useful Output:

Doc 1: Nowadays, the Mississippi River runs for about 2,340 miles from Lake Itasca to the Head of the Passes. Even this number is not set in stone, and
Doc 2: The Mississippi River is the second longest river in North America measuring a total length of 2320 miles from its traditional source at Lake Itasca.
Doc 3: Mississippi–Missouri–Jefferson–Beaverhead–Red Rock–Hell Roaring, 6,275, 3,902, 3,248,000, 21,300, Gulf of Mexico · United States (98.5%), Canada (1.5%). 5
Doc 4: The Arkansas River, at 1,469 miles in length, is one of the most significant tributaries of the entire Mississippi River drainage network and is
Doc 5: The Mississippi River flows about 2,350 miles, according to the National Park Service. The Missouri River flows about 100 miles longer