'Threshold of the Unknown Region' Summary

Threshold of the Unknown Region by Clements Markham tells the story of polar exploration from its earliest days to the late 19th century. Markham, himself a polar explorer and the President of the Royal Geographical Society, provides a comprehensive and detailed account of the expeditions that have shaped our understanding of the Arctic and Antarctic. The book covers a wide range of topics, including the search for the Northwest Passage, the exploration of the North and South Poles, and the scientific discoveries made during these expeditions.