Question: Whats it called when fresh and saltwater meet?

Disambiguated questions and answers:
context: Brackish water condition commonly occurs when fresh water meets seawater. In fact, the most extensive brackish water habitats worldwide are estuaries, where a river meets the sea.
question: Whats the water called when fresh and saltwater meet and mix?
short_answers: brackish
brackish water
wikipage: Brackish water
context: This type of ecological succession from a freshwater to marine ecosystem is typical of river estuaries. River estuaries form important staging points during the migration of anadromous and catadromous fish species, such as salmon, shad, and eels, giving them time to form social groups and to adjust to the changes in salinity. Salmon are anadromous, meaning they live in the sea but ascend rivers to spawn; eels are catadromous, living in rivers and streams, but returning to the sea to breed. Besides the species that migrate through estuaries, there are many other fish that use them as "nursery grounds" for spawning or as places young fish can feed and grow before moving elsewhere. Herring and plaice are two commercially important species that use the Thames Estuary for this purpose.
question: Whats the coastal body called when fresh water from a river and saltwater from the sea meet?
short_answers: estuary
wikipage: Brackish water
context: Saltwater intrusion is the movement of saline water into freshwater aquifers, which can lead to groundwater quality degradation, including drinking water sources, and other consequences. Saltwater intrusion can naturally occur in coastal aquifers, owing to the hydraulic connection between groundwater and seawater. Because saline water has a higher mineral content than freshwater, it is denser and has a higher water pressure. As a result, saltwater can push inland beneath the freshwater. Certain human activities, especially groundwater pumping from coastal freshwater wells, have increased saltwater intrusion in many coastal areas. Water extraction drops the level of fresh groundwater, reducing its water pressure and allowing saltwater to flow further inland. Other contributors to saltwater intrusion include navigation channels or agricultural and drainage channels, which provide conduits for saltwater to move inland. Sea level rise could also contribute to saltwater intrusion. Saltwater intrusion can also be worsened by extreme events like hurricane storm surges.
question: Whats it called when fresh and saltwater meet in freshwater aquifers, possibly degrading groundwater?
short_answers: saltwater intrusion
wikipage: Saltwater intrusion
context: Groundwater extraction is the primary cause of saltwater intrusion. Groundwater is the main source of drinking water in many coastal areas of the United States, and extraction has increased over time. Under baseline conditions, the inland extent of saltwater is limited by higher pressure exerted by the freshwater column, owing to its higher elevation. Groundwater extraction can lower the level of the freshwater table, reducing the pressure exerted by the freshwater column and allowing the denser saltwater to move inland laterally. In Cape May, New Jersey, since the 1940s water withdrawals have lowered groundwater levels by up to 30 meters, reducing the water table to below sea level and causing widespread intrusion and contamination of water supply wells.
question: Whats it called when fresh and saltwater meet because saltwater moves inland due to a loss in freshwater column pressure?
short_answers: groundwater extraction
wikipage: Saltwater intrusion

Long-form answers:
knowledge: content: The River Thames flowing through London is a classic river estuary.
wikipage: Brackish water Estuaries
long_answer: Brackish water condition commonly occurs when fresh water meets seawater. The most extensive brackish water habitats worldwide are estuaries, where a river meets the sea. The River Thames flowing through London is a classic river estuary. Saltwater intrusion is the movement of saline water into freshwater aquifers, which can lead to groundwater quality degradation, including drinking water sources, and other consequences. Groundwater extraction is the primary cause of saltwater intrusion. Groundwater extraction can lower the level of the freshwater table, reducing the pressure exerted by the freshwater column and allowing the denser saltwater to move inland laterally.