Answer
Estuaries are associated with submergent coasts. A submergent coast is a type of coastal landform where the land is gradually sinking or subsiding relative to sea level. As the land sinks, the sea level rises or encroaches inland, leading to the formation of estuaries. Estuaries are semi-enclosed coastal bodies of water where freshwater from rivers and streams mixes with saltwater from the ocean. They form in coastal areas with drowned river valleys or coastal plains that have been flooded by rising sea levels.
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