The physical features of a region are referred to as its topography.

Here are some other terms related to physical features:

* Landforms: The specific shapes of the Earth's surface, like mountains, valleys, plateaus, and plains.

* Terrain: The physical characteristics of a particular area, including elevation, slope, and vegetation.

* Geography: The study of the Earth's surface, including its physical features, climate, and human populations.

* Geomorphology: The study of landforms and the processes that create them.

Let me know if you'd like more information about any of these terms!