What does ～区 mean?
～区 is a Japanese suffix meaning “ward (suffix)” in English. It is written as ～区 in kanji, ～く in hiragana, and ～ku in romaji. This word is part of JLPT N4 vocabulary.
NoteSuffix for a city ward (新宿区 = Shinjuku Ward).
Example sentences
都庁は新宿区にある。
The Tokyo Metropolitan Government Building is in Shinjuku Ward.
東京には二十三の区がある。
Tokyo has twenty-three wards.