A man is standing at the top of the mountain, and a sheep is at the foot of the mountain.

Solve the riddle: A person crosses a sheep, which we can understand as a person crossing a sheep, that is, jumping over a sheep. The homonym for jumping sheep is Yueyang. It can be said that Yueyang fully conforms to the content expression of the riddle. So the answer is Yueyang. Yueyang was called Baling in ancient times, also known as Yuezhou. It is a prefecture-level city under the jurisdiction of Hunan Province.