Cachoeira Mandassaia is a waterfall reached by hiking into a green, rock-filled canyon in the Diamantina Mountains region of Bahia.

The approach is notably more demanding than surrounding trails, rated moderate to difficult, and requires a guide to assess conditions before the group proceeds.

Reaching the falls adds roughly 4 kilometers to a standard day hike, bringing the total round trip to approximately 18 km and up to 8 hours of walking.

After heavy rain the trail into the canyon becomes very slippery, and a guide may cancel the waterfall leg entirely if safe passage cannot be guaranteed for the group.