Brackish water is commonly found in:

Correct Answer: Estuaries

Brackish water is water that has a salinity level between that of freshwater and seawater. It is most commonly found in estuaries, where rivers meet the sea and freshwater mixes with saltwater. Estuaries are among the most productive ecosystems on Earth, providing habitats for numerous species of fish, birds, crustaceans, and aquatic plants. These environments also serve as important breeding and nursery grounds for many marine organisms. Because salinity levels change with tides, rainfall, and river flow, organisms living in estuaries have developed unique adaptations to survive in fluctuating conditions. Estuaries also protect coastlines from erosion and improve water quality by filtering pollutants.

• Water Type: Brackish water.
• Common Location: Estuaries.
• Formed By: Mixing of river water and seawater.
• Importance: Rich biodiversity and fish breeding grounds.
• Correct Answer: Estuaries.