Xishuangbanna, Sipsongpanna, or Sibsongbanna, abbreviated to Xidai (Chinese: 西傣; pinyin: Xīdǎi; สิบสองปันนา), is an autonomous prefecture in the south of Yunnan province, People's Republic of China. The prefectural seat is Jinghong(Chiang Rung, Jeng Hung, Keng Hung or Chieng Hung; Tai Lü: ᦋᦵᧂᦣᦳᧂᧈ, Tai Lü pronunciation: [t͡sêŋ.hūŋ], เชียงรุ่ง), the largest settlement in the area and one that straddles the Mekong River, called the Lancang River in Chinese.