Giant 'Underground Sea' of Over 80 Square Kilometers Discovered in Segrià

The Ebro Hydrographic Confederation locates a massive water body between Alfarràs and Alcarràs to be studied through 2033.

Generic image of an agricultural landscape with a symbolic representation of water underground.
IA

Generic image of an agricultural landscape with a symbolic representation of water underground.

The Ebro Hydrographic Confederation (CHE) has identified a massive underground water body covering 81.62 square kilometers in the Segrià region, in an area that hosted a vast river network millions of years ago.

This new water reservoir, officially named Planes de Raimat-Monreal, is shaped like an elongated isosceles triangle. The aquifer stretches approximately 30 kilometers from north to south, with its boundaries reaching the towns of Alfarràs, Alcarràs, Raimat, and El Pla de la Font. Technical reports indicate that most of this reserve lies beneath the municipalities of Gimenells i el Pla de la Font and Almacelles.

"There is not enough information to develop an action plan for the aquifer, nor regarding its hydrological characteristics or the impacts it faces."

Ebro Hydrological Plan · Official documentation
The discovery was made during preliminary work for the new Ebro Hydrological Plan (PHE). This water mass is considered independent, as it lacks lateral contact with other aquifers. It is primarily recharged by rainfall and irrigation runoff from the Aragon and Catalonia Canal, while natural discharges flow toward the Clamor Amarga river.