Tumpak Sewu Waterfalls, Tiered waterfall in Lumajang Regency, Indonesia.

Tumpak Sewu Waterfalls in Lumajang is a cascade system where water drops about 120 meters down a semicircular cliff face, splitting into many separate streams across the rock. These multiple channels create an ever-changing pattern of white water flowing into the canyon below.

The waterfall sits on the boundary between Lumajang and Malang regencies, in the villages of Sidomulyo and Sidorenggo. Its curved cliff was formed by lava and pyroclastic deposits from volcanic activity on Semeru, the mountain that rises behind it. The Glidik River, which begins on Semeru's southern slopes, feeds the falls and later joins the Besukcukit before reaching the Indian Ocean.

In Javanese, tumpak sewu means "stacked thousand", and locals also call the falls Coban Sewu, "a thousand waterfalls". The name describes the many separate streams dropping side by side over the curved cliff. Tourism here is run with a strong community approach: villagers handle access, guiding and support facilities.

The route into the box canyon uses built infrastructure, but entering or exiting still takes about an hour and is physically demanding. Sturdy shoes help on wet sections, and the climb back up takes as long as the descent.

The waterfall sits on the boundary of two villages, Sidomulyo and Sidorenggo, and two regencies, Lumajang and Malang. Its curved cliff was formed by lava and pyroclastic deposits from Semeru's eruptions. The Glidik River later joins the Besukcukit before reaching the Indian Ocean.