Which term refers to physical geography and natural features of terrain?

The term that refers to physical geography and natural features of terrain is "Natural physiographic regions." This term encompasses the study of the Earth's physical features, such as mountains, valleys, plains, and rivers, which are significant in understanding the geographical layout and ecological systems of an area. Physiographic regions are typically defined by their unique landforms, geology, and external characteristics that shape the environment.

In contrast, geographic regions might include both physical and human-made features without specifically focusing on natural terrain. Cultural landmarks refer to structures or places that have historical or cultural significance to people, which does not pertain to the natural landscape itself. Environmental characteristics can describe a broader set of elements including climate, flora, and fauna, but it may not specifically focus on the physical structure of the terrain. Thus, "Natural physiographic regions" is the most precise term for the physical geography and natural features of the terrain.