蔚 ㄩ ˋ yù 县 ㄒㄧㄢ ˋ xiàn 蔚 ㄩ ˋ yù 縣 ㄒㄧㄢ ˋ xiàn Yu county in Zhangjiakou 張家口|张家口[Zhang1 jia1 kou3], Hebei