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beach sand water sea sky sun summer travel vacation paradise tropical island nature landscape seascape coast shore wave foam surf swell tide ebb flow high tide low tide spring tide neap tide king tide equinoctial tide solstitial tide perigean tide apogean tide syzygy tide quadrature tide lunar tide solar tide diurnal tide semidiurnal tide mixed tide irregular tide tidal bore tidal wave tsunami storm surge sea level sea level rise sea level fall sea level change coastal erosion coastal accretion sediment transport beach nourishment land reclamation mangrove forest coral reef fish marine life ecosystem environment conservation protection sustainability