Beneath the Surface by Colin Fletcher

Colin Fletcher was born in Wales and educated in England. He died in 2007. After serving in the Royal Marines, farming in Kenya, surveying in Zimbabwe, and exploring in northern and western Canada, he went to California in 1956. He is the first person to walk the length of Grand Canyon National Park from the rim to the bottom. The Thousand-Mile Summer, The Man Who Walked Through Time, River, The Hidden Worlds of Colin Fletcher, and three prior versions of The Complete Walker are among his many books on walking and the outdoors.