The Mãe d'Água das Amoreiras Reservoir, also known as the Reservatório da Mãe d'Água, is an architectural and historical gem in Lisbon, located in Praça das Amoreiras. It was designed in 1746 by the Hungarian architect Carlos Mardel to receive and distribute water from the Aguas Libres Aqueduct. Construction lasted 88 years, and other architects such as Reinaldo Manuel dos Santos also participated.