San Andrés Island (A) simplified geological map (modified from Geister, 1975, and the Geological map of Colombia, Gómez et al., 2015); (B) Neighborhood map (modified from http://www.sAndrés.gov.co); (C) Simplified aquifer map and recharge areas within the El Cove basin. Also shown are a limited number of the up 5900 wells on San Andrés Island used by the municipal aqueduct, commercial enterprises and hotels (map modified from CORALINA 2009); (D) Simplified topographic map showing the areas of the island of 0–6 m elevation, prone to inundation during major storm events (Map modified from Geister, 1975).