Salt water encroachment
"Phenomenon occuring when a body of salt water invades a body of freshwater. It can occur either in surface or groundwater bodies." (United Nations Publications, 2013)
Sources
United Nations Publications. "Glossary of Shared Water Resources (English-Arabic): Technical, Socioeconomic and Legal Terminology." (2013). DOI:https://dx.doi.org/10.18356/70b462ce-en