Countries and regions of interest
Learning a foreign language(whether it's English or Japanese or whatever the language it is) is almost as well as leaning its culture. Language is not just a tool of communication but it is a bridge that connects you with different countries, different cultures and different people that help you widen your knowledge, enhance your personality and enlighten your life.
BTW, I kinda grew up in the US but have been back in Japan for the past decades and almost have forgotten how to speak English properly, lol. So I've started to learn again :)