Mularroya reservoir, reservoir in La Almunia de Doña Godina, Spain
The Mularroya reservoir is a water storage structure in Zaragoza Province, Spain, built around a dam on the Grío River and connected by an underground tunnel to the Jalón River system. The facility is designed primarily to supply irrigation water to farmland across the surrounding area.
Planning for the project began in the 1990s, but legal challenges and technical requirements delayed construction by decades. After several stops and updated permits, work resumed in earnest during the 2010s.
The reservoir sits in a dry farming region where water has long shaped the rhythm of rural life. Communities nearby have followed the project closely, as it is expected to change how surrounding farmland is watered for generations.
The site is in a remote part of Zaragoza Province, far from major towns, and can be reached by dirt roads used mainly for maintenance. Since this is an active construction and infrastructure site, access to certain areas may be restricted, so it is worth checking in advance.
The tunnel that links the two river systems was bored through solid rock using a large tunneling machine, and its path is entirely invisible from the surface. This means that water can be moved between two separate rivers without any sign of it above ground.
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