Chachani drains into the Rio Chili. The Quebrada Canchero, Quebrada Cabrería and Quebrada Traccra drain south to eastward into the river which flows around the southeastern side of Chachani and has cut a canyon between Chachani and El Misti. The Rio Sumbay, one of its tributaries, runs along the eastern side of Chachani. The Rio Yura flows southward along the western side of Chachani, and upon reaching the then westward-flowing Rio Chili becomes the Rio Vitor, which eventually discharges into the Pacific Ocean together with the Rio Siguas.