Tiantangzhai, Mountain summit in Jinzhai County, China.

Tiantangzhai is a mountain summit reaching 1,729 meters that straddles the border between Hubei and Anhui provinces in eastern China. The peak encompasses three national forest parks and contains numerous hiking trails across different terrain types.

The mountain was known as Yun Shan during the Tang dynasty and later renamed Duoyun Shan in the Yuan period. It received its present name during the Qing era and has remained Tiantangzhai since then.

The name Tiantangzhai dates from the Qing dynasty; during the Tang and Song it was Yun Shan (Cloud Mountain), and in Yuan and Ming times Duoyun Shan (Mountain of Many Clouds). The mountain is also called "Number one pass in the southeastern Yangtze River region" (吴楚东南第一关). Its waterfalls, including the Jiuying, Xieyu and Sidie falls, are celebrated in the saying "踏遍黄峨岱与庐，唯有天堂水最佳".

The summit sits on the Hubei-Anhui border, reached from Luotian County in Hubei or Jinzhai County in Anhui, with three national forest parks around it. The Huai and Yangtze watershed runs across the massif, so streams on opposite sides flow to different rivers. Paths pass the waterfall groups, including the Jiuying, Xieyu and Sidie falls, and the Baihua Gorge.

The watershed between the Huai and Yangtze rivers runs across the summit, which is why the mountain is called the "Number one pass in the southeastern Yangtze River region". The protected area is divided into five zones: the waterfall group, Shenggua Peak, Baima Peak, Zaoqian'ao and Baima Canyon. The waterfall group alone holds more than 100 waterfalls, streams and pools, among them Jiuying, Xieyu and Sidie falls.