古洞 [－－]

Jyutping gu2 dung6
Pinyin gǔ dòng

Definitions (粵典–words.hk)
  1. 名詞、專名
    香港​地區​名​；​位​於​新界​北區​，​上​水​以西​，​落馬洲​以東
    Kwu Tung
Definitions (Wiktionary)
  1. name
    Kwu Tung (an area in Hong Kong)