Want to know the currency of China? Capital of Brunei? Longest river in Europe? Use this base which lists all countries (and a selection of overseas territories/disputed regions, etc.) as well as their capitals, currencies, languages and any major topographical features (rivers, lakes, mountains, etc.).
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It's also a work in progress, but if you want to gently push me to update a specific section, or want to contribute, reach out to ambigram0@gmail.com.
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Happy learning, fellow travelers!