Dromo County or Chomo (Tibetan: གྲོ་མོ་རྫོང༌།, Wylie: gro-mo rdzong ) or Yadong County (simplified Chinese: 亚东; traditional Chinese: 亞東; pinyin: Yàdōng; Wade–Giles: Ya-tung) is a frontier county and trade-market of Tibet Autonomous Region, China, situated in the mouth of the Chumbi valley near the China-India and China-Bhutan border. It lies in the middle part of Himalayas and the south of Tibet Autonomous Region, covering about 4,306 square kilometers with a population of 10,000. It is under the jurisdiction of Xigazê.
The town of Dromo (Yadong) Coordinates: 27°29′22″N 88°54′21″E / 27.48944°N 88.90583°E / 27.48944; 88.90583 is very close to the borders of both the Indian state of Sikkim and Bhutan and has a hotel, a guest house, some government offices and army barracks.
Local specialities include Dromo fish and barley wine while the main tourist sites are Donggar Monastery, Garju Monastery and Kangbu Hotspring. Yadong is connected to the Indian state of Sikkim via the Nathu La.