These are the longest river entirely inside the United States of America, Have Fun!
I do accept quiz suggestions, if your suggestion is chosen then you will receive credit in the description. *The answer is the one that flows through Austin.
Note: does not include rivers that flow between the US and another country. Data from https://en.wikipedia.org/wiki/List_of_longest_rivers_of_the_United_States_(by_main_stem) and the length is in miles.
If you think that this quiz deserves it, please nominate it, I would really like to have some more featured quizzes if possible.