Tributaries on the left bank of the Tordino include the protective irrigation drain known as the Cavata (including three terraces and their associated cascades near the source of the Tordino), the Rivettino, the Castiglione, the Rivoletto, the Rio Verde, the large ditch known as "The Inferno," the 9 kilometers Fiumicino stream, and the Vezzola river.