Africa, Asia and the Americas. Groundwater flowing through weathered rock, sometimes referred to as 'regolith' or 'saprolite', is able to provide significant well yields and, in many places, is the only
source of potable water supply that is available to rural communities. Aquifers within mantles of deeply weathered crystalline rock are, however, neither well understood nor well utilized. This paper describes
both the evolution and basic characteristics of these aquifers and highlights the potential for improved development of this resource by rural communities.