'Tis a great journey to the world's end.

The saying treats the “world’s end” figuratively, as an imagined outer limit and an exceedingly distant destination. It emphasizes that some aims, places, or undertakings lie so far away that reaching them demands exceptional travel, time, or effort.

It can also express a practical sense of proportion: what is imagined as the farthest possible destination should not be approached casually. The image conveys daunting remoteness rather than identifying any actual geographical boundary or literal place.

Use it figuratively when describing a destination or task that feels extremely far off or burdensome to reach, not as a reference to a literal location. Its old-fashioned contraction and grand image give the remark a literary, deliberately dramatic tone.