Chinese: 栖云山 (Qīyún Shān)
Location: Across the road from Xinglong Shan. See here for more information.
For Qiyun Shan (lit. 'roosting in the clouds' mountain), continue another 300m past the entrance to Xinglong Shan. It's on the right.
This is the harder climb of the two mountains, but is probably more satisfying, as you reach an obvious mountaintop. It takes around 2 hours, with a very steep flight of stairs on the final section (the "Ladder to Heaven"). You can also visit Chiang Kaishek's 'mansion', built by the Gansu KMT to accommodate him during a visit in 1941.