'Yan suburbs') is a town under the administration of Sanhe City in central Hebei province,[1] bordering Tongzhou District, Beijing across the Chaobai River to the west, located 35.5 kilometers (22.1 mi) east of Tiananmen Square and 21 km (13 mi) west of the urban area of Sanhe.

Before the establishment of the People's Republic, the area was administered by Tong County (present-day Tongzhou District), then in 1950 was ceded to Sanhe County; from 1958 to 1961, as part of the greater collectivization of agriculture, it was a part of Hongxing People's Commune (紅星人民公社); 1962 saw Hongxing being split into three smaller communes, amongst them Yanjiao itself.

Economic reforms led to the abolishing of the commune and the establishment of Yanjiao as a town in March 1983.

[2] Yanjiao is located in the extreme western end of Sanhe City and in the northwest of the Sanhe–Xianghe–Dachang exclave of Hebei.

[2] China National Highway 102 provides access to nearby Tongzhou District as well as downtown Sanhe, while Beijing Capital International Airport is 35 kilometers (22 mi) away by road.