There were three watchers, two men and a boy. They were using telescopes, not field glasses. It was a question of distance. They were almost a mile away from their target area, because of the terrain. There was no closer cover. It was low, undulating country, burned khaki by the sun, grass and rock and sandy soil alike. The nearest safe concealment was the broad dip they were in, a bone-dry gulch scraped out a million years ago by a different climate, when there had been rain and ferns and rushing rivers.
-Lee Child, Echo Burning: A Jack Reacher Novel