An island overgrown with greenery, in the middle of the seaAn island overgrown with greenery, in the middle of the sea
Houses on stilts in the sea are reflected in the waterHouses on stilts in the sea are reflected in the water
A joyful girl runs through the sand. vacation by the seaA joyful girl runs through the sand. Vacation by the sea
Часть океана — большое водное пространство с горько-солёной водой. Большое количество чего-н. ( высок. ). Повальная смерть, эпидемия.