"el charco del ingenio"
title of a chapter in the book titled Donde Habiltan los Angeles. In the chapter, the children and their uncle visit a pond called "el charco del ingenio.
4 Answers
ingenio is also:
apparatus, engine, device; mill, plant, foundry; (Latin America) refinery, industrial site where materials are processed and made suitable for use.
Maybe it´s a pond by the mill.
And I also found this:
Localizado en el corazón del altiplano mexicano, en el Estado de Guanajuato, el Jardín Botánico El Charco del Ingenio comprende 67 hectáreas de reserva natural, a pocos minutos de San Miguel de Allende, ciudad histórica y monumental declarada Patrimonio de la Humanidad.
In the heart of the central highlands of Mexico, in the state of Guanajuato, El Charco del Ingenio Botanical Garden extends over some 167 acres of nature reserve just a few minutes from the historical city of San Miguel de Allende, declared a World Heritage site in 2008.

found this about the origin of the name of this park
El Charco del Ingenio es un monumento natural extraordinario, dotado de una gran biodiversidad. Su nombre proviene de una poza natural encajada al fondo de una imponente cañada, a la cual la imaginación popular ha rodeado de espíritus y leyendas que se remontan a los tiempos de la Conquista.
Meaning it name is originated by one small pond, which the popular imagery had surrounded by spirits and legends from the times of the conquerors...
I've always thought of charco as a puddle, perhaps it can also be pond,
if so, I think it would translate as The Pond of Ingenuity
Note: This is wrong it seems. Ingenuity is genius sorry.
El chargo del ingenio means The pond of genius. Probably an imaginary place where people go to learn something.