What does ～カ国 mean?
～カ国 is a Japanese counter meaning “counter for countries” in English. It is written as ～カ国 in kanji, ～かこく in hiragana, and ～kakoku in romaji. This word is part of JLPT N3 vocabulary.
Example sentences
この会議には二十カ国が参加した。
Twenty countries took part in this conference.
これまでに十カ国を旅行した。
I've travelled to ten countries so far.