It is a pre-Columbian system of underground aqueducts that from the Andes continues to irrigate the three valleys where the famous Nazca geoglyphs are located. The wells have a depth of up to 15 meters and 29 still carry water from snow-capped mountains and rivers to farmland where potatoes, cotton, vegetables and fruit trees are planted.
The system carries about 18 to 20 liters of water per second and currently benefits about 900 families of small farmers in three Nazca valleys.