Meaning of にしがわ in Japanese

この公園の西側に近いところは、道路の騒音も大きいが、奥にはいるともう聞こえない。
Near the west side of the park there's a lot of noise from the road, but when you go into the park you can't hear it any more.

西側諸国はドルを強めるために、協議し合わなければなりません。
Western nations have to put their heads together to strengthen the dollar.