An estuary is a body of water where freshwater from rivers and streams mixes with saltwater from the sea. Estuaries are productive ecosystems located at the interface between freshwater and saltwater influences. The salinity in estuaries varies depending on tides and seasons, with lower salinity during rainy seasons when freshwater influx is highest. Estuaries are classified into four main types: coastal plain, tectonic, bar-built, and fjord estuaries.

1. Estuaries
By Xcean Dave Monteagudo

2. The things that we will learn today:
•To determine what estuaries are
•To identify their characteristics
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3. What are Estuaries?
• Attractive water forms
• Productive and dynamic
ecosystems (a natural
Habitat)

4. An estuary is a water form where the freshwater from
rivers and streams meets the salt water from the sea.
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5. An estuary is a water form where the freshwater from
rivers and streams meets the salt water from the sea.
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AETUS AESTUARIUM

6. An estuary is a water form where the freshwater from
rivers and streams meets the salt water from the sea.
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AETUS AESTUARIUM

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The water level and
the salinity in
estuaries vary,
depending on the
tides and the
seasons.

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FRESHWATER
Rainy Season
Less Salty

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SALTYWATER
Dry Season
Saltier

10. Classification of Estuaries
1.Coastal plain estuaries
2.Tectonic estuaries
3.Bar-built estuaries
4.Fjord estuaries
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11. Classification of Estuaries
1.Coastal plain estuaries
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12. Classification of Estuaries
1.Coastal plain estuaries
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13. Classification of Estuaries
1.Coastal plain estuaries
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San Miguel Bay
in Naga City

14. Classification of Estuaries
2.Tectonic Estuaries
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15. Classification of Estuaries
3. Bar-built estuaries
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16. Classification of Estuaries
3. Bar-built estuaries
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Anawangin
Cove, Zambales

17. Classification of Estuaries
4. Fjord estuaries
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18. Classification of Estuaries
4. Fjord estuaries
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