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Coastlines refer to the boundary where the land meets the sea or ocean. They are characterized by a dynamic interface of land and water, often shaped by various natural processes such as erosion, deposition, and weathering. Coastlines can vary greatly in features, including sandy beaches, rocky cliffs, tidal flats, and estuaries. They play a crucial role in providing habitats for diverse marine and terrestrial species, as well as serving as important areas for human recreation, transportation, and economic activities.