[Miguel Rangel Medina] A coastal aquifer is a hydrogeological unit whose basic characteristic is that one of its geographiclimits is the sea or the coastline. In this sense, the unit is generally understood as representingthe water discharge from a continental hydrologic basin. This type of aquifer is highly sensitive togroundwater extraction by wells, since unlike a continental aquifer where over-exploitation iscompensated by taking water from storage, coastal aquifers allow the entrance of sea waterinstead...