What feature can a river flow through?
Options:
- valley
- wisconsin
- wilderness
- bridge
- waterfall
Let's think now! Step-by-step reasoning:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
River can easily flow through a valley. Valley is the area between hills where river flows.
So, the final answer is valley.