Sanhe is a county-level city administered by the Langfang prefecture-level city in eastern Hebei province, People's Republic of China with around one million people. Sanhe city, Dachang Hui Autonomous County, and Xianghe County form the "Northern Three Counties of Langfang", an exclave of Hebei province surrounded by the Beijing and Tianjin muni…Sanhe is a county-level city administered by the Langfang prefecture-level city in eastern Hebei province, People's Republic of China with around one million people. Sanhe city, Dachang Hui Autonomous County, and Xianghe County form the "Northern Three Counties of Langfang", an exclave of Hebei province surrounded by the Beijing and Tianjin municipalities.