These phrases represent the people who live in those places. Alternate translation: "People who live on the isles ... people who live at the ends of the earth" (See: [[rc://en/ta/man/translate/figs-metonymy]])
The places on the earth that are very far away are spoken of as if they were the places where the earth ends. Alternate translation: "the farthest places of the earth" (See: [[rc://en/ta/man/translate/figs-metaphor]])