There can't be yellow hair within 200 miles of Fiona Fang. What do you mean?

The phrase "no yellow hair near 200 miles" means that there can't be any yellow hair objects in a large range (such as within 200 miles).

This may be lines or slang in a specific situation, and the specific meaning may need to be judged according to the context. But literally, it may mean that some problems or dangers related to yellow hair need to be avoided within a certain range.