どこか
どこか · dokoka · JLPT N3 · noun
somewhere
🗺️ どこか = doko (where) + ka (question marker) → some-where
Adding か to a question word turns it into an indefinite: だれ who → だれか someone, なに what → なにか something, どこ where → どこか somewhere. The か makes the question open-ended, so the place stays unknown.