I put "China is located to Japan's West." In retrospect, I realize it is not a colloquial as the given answer. But is it incorrect? It is valid English grammar. And it is actually closer to the actual Japanese phrasing 日本の西.
I find really is that West in JP is Nishi (kinda sounds like Migi = Right) and East is Higashi (Left being Hidari). Similar sounds for totally opposite directions, they even have the same number of syllables!. It's phonetically confusing