Isaiah uses these questions to emphasize that the people should know Yahweh's greatness. See how you translated these in [Isaiah 40:21](../40/21.md). Alternate translation: "You certainly know and have heard!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
The places on the earth that are very far away are spoken of as if they were the places where the earth ends. This phrase also forms a merism and refers to everywhere in between the ends. AT "the farthest places of the earth" or "the entire earth" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-merism]])