In studying the inescapable physical setting of history, writes the author, the geographer examines one of the strands from which history itself is woven. To illuminate the vital relationship between history and geographical conditions, W. Gordon East draws examples from ancient times to the mid–twentieth century. He demonstrates that when we look at the physical conditions under which an event occurs, we find that "the particular characteristics of this setting serve not only to localise but also to influence part at least of the action." Topographical position, climate, distribution of water and minerals, the placement of routes and towns, and ease or difficulty of movement between districts and countries are among the factors which the historian must take into account.