Levison has recently returned from his most challenging, and dangerous, expedition to date – a 5,000-mile circumnavigation of the Arabian Peninsula from Iraq to Lebanon.

Every adventure Levison goes on isn't without its risks “Our taxi flew off the edge of a cliff,” recalls Levison. “I was very lucky to survive. The car rolled about 10 times.

A different challenge, Levison says, will be whether pebble accretion could explain the diversity 6 of terrestrial planets in our own Solar System.

This is an edited extract from Walking The Nile by Levison Wood (Simon & Schuster, £18.99). His documentary series of the same name continues on Channel 4.

Walking the Americas by Levison Wood will be published by Hodder & Stoughton (£20) on February 23. The Channel 4 series of the same name can be seen on demand until the end of the month at ...

Explorer Levison Wood has ­always longed to get up close to elephants in the wild. But a “close shave” with a huge male while filming his new Channel 4 series Walking with Elephants took ...

Levison Wood, who previously walked the length of the Nile River, has now trekked 1,700 miles, from Afghanistan to Bhutan, along the Himalayan mountain range.

Levison, an ambassador for charity Tusk Trust, writes in The Last Giants that he “decided there and then that I wanted to become an artist too, and see for myself the wild elephants in Africa”.

Ladar Levison’s three-year fight for freedom to speak about the government order that shuttered Lavabit, his secure email service, is finally over. Levison was finally able to confirm today that ...

Explorer Levison Wood knows what it is like to test your body to its limits. The former British Army captain has trekked alone across the Himalaya mountain range for TV documentary.

British explorer Levison Wood crossed deserts, jungles and war zones during his 4,000-mile expedition along the length of the River Nile. Here he tells Telegraph Men ten things he learned ...