Hukou Waterfall, Yellow River waterfall on the Shanxi-Shaanxi border, China

Hukou Waterfall is a 15 m high, 20 m wide fall where the Yellow River, narrowed to 20–30 m between the Hukou and Longmen mountains, pours into a gorge likened to a giant teapot. Its width varies seasonally, usually 30 m but up to 50 m in flood season, with a maximum face of 30,000 m². The Qilangwo Bridge crosses the river just below the falls.

Ancient Chinese tradition holds that King Yu split a mountain downstream to manage the Yellow River's flow during early civilization. This legend ties the waterfall region to humanity's earliest attempts at controlling this powerful river.

The name Hukou means "flask mouth": the 500-metre-wide Yellow River is squeezed into a channel 20–30 metres wide, and the Shangshu chapter "Yu Gong" already describes the whirlpool as "like a flask". Two local sights are named: "boats sailing on dry land", when craft are hauled around the falls, and "smoke rising from the water", the spray cloud above the drop.

Visitors should wear sturdy shoes, as pathways around the waterfall area can be uneven and slippery. Expect wet conditions, especially when approaching the water or using viewing platforms near the cascading water.

The waterfall appears on the older fourth series of the renminbi 50-yuan banknote. Just below the falls, a shining stone called guishi moves up and down with the water level and stays at least partly visible even in high water.