reservoir
US /ˈrez.ɚ.vwɑːr/
UK /ˈrez.ɚ.vwɑːr/

1.
embalse, presa
a large natural or artificial lake used as a source of water supply
:
•
The city's water supply comes from a large reservoir.
El suministro de agua de la ciudad proviene de un gran embalse.
•
They built a new dam to create a bigger reservoir.
Construyeron una nueva presa para crear un embalse más grande.