For example- Mongolia refers to more or less the same region with both clues; Western Sahara is definitively just referring to part of the desert that's already mentioned; and Macedonia is just asking for controversy, since you're talking about two different parts of the same politically-charged region.
On the other hand, Pearl, Bad, Cedar, and Sierra are great since they refer to drastically distinct geographic entities.
Geography is not ONLY about places. However, calling a flag a geographical feature loosens the definition to the point where pretty much EVERYTHING is a geographical feature. Why not add Hannah Montana and Dakota Fanning to your quiz as well? They're certainly a part of "the lands, the features, the inhabitants, and the phenomena of Earth" as much as a flag is.
From my own visit to Macedonia, the country, and Macedonia, the Greek region, neither place feels "politically charged" - the only beef is just around the name: the Greeks are irritated that Macedonia, the country, is naming itself with a name that many Greeks feel belong to them.
As opposed to Pearl or York, which refer to two entirely different areas of the world, SAHARA and MONGOLIA e.g. are just the two different references to the same term.
Refer to the North/South "Dakota" example above. It demonstrates the problem with using this kind of reference.
I had to laugh about the "wich"-key.