Does the subject want to ask "which checkpoint does Langwan Road go through to Miyun"? Xinchengzi checkpoint. According to Baidu map, Langwan Road leading to Miyun is at the entrance of Caijiadian Village, Xinchengzi Town, Miyun District, and there is a checkpoint called Xinchengzi Checkpoint. Miyun District belongs to Beijing. Located in the northeast of Beijing, it is an important drinking water source base and ecological conservation area in Beijing. With a total area of 2229.45 square kilometers, it is the largest area in Beijing.