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PrefaceWelcome to the 22 nd Salt Water Intrusion Meeting,to be held from 17 th to22 nd of June 2012 in Búzios, Brazil. It will be co-organized by the GeologyDepartment of Federal University of Rio de Janeiro (UFRJ), the EngineeringSchool of Federal University of Pernambuco (UFPE) and the BrazilianGroundwater Association (ABAS-RJ), with the collaboration of CivilEngineering Laboratory of Northern Rio de Janeiro State University (UENF).Salt Water Intrusion Meeting (SWIM) has been held since 1968. Since the firstmeeting in Hanover, Germany, as an initiative of researchers from a fewNorthern and Western European countries, the scope and number of SWIMparticipants increased steadily over the years. In the last meetings, it becamea fully international event, with participants from all over the world.In2008,after merging with Salt Water Intrusion in Coastal Aquifers (SWICA)meeting, SWIM took place for the first time outside Europe.In the present 22 ndEdition for the first time a SWIM meeting is organized in the SouthernHemisphere,having received more than 100 abstracts sent from 20 countriesof the five continents,thus confirming the growing worldwide interest in theevent.The meeting in Brazil will consist of an informal environment where studentsand those novices in the saltwater intrusion field can interact with establishedand well-known experts who are actively involved in and/ or affected by saltwater intrusion problems.Saltwater interfaces, not only in coastal areas butalso near salt deposits inland or offshore, are more and more the subject ofscientific and economic interest worldwide. Particularly in Brazil, althoughwith more than 8000 km of coast line and huge oil reserves recentlydiscovered under layers of salt (pre-salt fields), mechanisms of interaction ofgroundwater bodies with varying salinity and the geological environment arebarely known. The SWIM meeting will represent a unique opportunity to localresearchers, stakeholders and students to discuss those issues.The seven topics selected for the 22 nd SWIM were an attempt to summarizesome of the most relevant subjects concerning the study of salt waterintrusion problems in coastal aquifers. The 103 contributions submitted bySWIM participants show the importance of using different tools to study thegroundwater salinization problems. A trend observed in the 21 st SWIM inAzores is confirmed here: improved hydrogeological data, geophysical andgeochemical tools are used to develop and validate numerical models tosimulate variable density groundwater flow. Numerical model limitations andthe need to simplify their use are also recognized. This will improve themanagement tools for coastal aquifers.