“Land,” the complex systems of biological and physical systems on which we and other nonhuman beings live, is very often taken for granted. Too often, the assumption is made that current landforms “are as they have always been,” or that the changes in landscapes have happened “naturally.” Environmental historians, ecologists, landscape architects, and many other professional realms have uncovered much about how land systems work, though, and how humans are changing them. Articles in this section center the materiality of land as a system, and call into question how much of that materiality can be taken for granted as a static backdrop to anthropogenic activity.