Qianlongyu is a small town situated at the entrance of one of the region's most important underground rivers. The town is heavily guarded by Denhou officials, and the checkpoint is critical for imports coming into the country. The town's architecture reflects the Denhou's preference for simplicity and practicality, with a focus on sturdy stone buildings and wide, open streets.
Due to its strategic location, Qianlongyu is off-limits to tourists and is accessible only to those with special permits. The town's primary purpose is to monitor and regulate the flow of goods and people in and out of the region. The checkpoint is an essential part of the Denhou's efforts to maintain stability and security in the region.