What trait is homogeneous is defined by the user. You can define any place on earth as being in an infinite number of regions, depending on what trait you pick. There is a sense of scale to all systematic inquiry, whatever the discipline. In biology, for example, some scientists study the smaller units of cells, genes or molecules while others take a larger view, examining plants, animals or ecosystems. Similarly, some historians may focus on a specific individual at specific point in time, while others take a broader view of international events changing over several decades or throughout a century.
Geographers also work at different scales.
Others do research at a still larger global scale, examining emerging trade networks between Asian countries and North America. Few villages today, however remote, are without contact to the modern world. Global economies draw upon local crops and resources, and , conversely, fluctuations in world commodity prices affect the well-being of those local people. Global TV and video introduce foreign styles, ideas, mannerisms, and expectations into small towns and remote settlements in formerly isolated parts of the world. Further, very few places and peoples are isolated from global politics and tensions, from the influences of superpowers, supranational organizations, or, increasingly, from the ambitions and agendas of regional separatists and national splinter groups.