Internal boundaries refer to divisions within a country that separate different regions or areas from each other. These boundaries can be physical (such as rivers or mountains) or cultural (such as ethnic or linguistic differences).
Related terms
Territoriality: The attachment individuals and groups have towards a specific area based on control and ownership.
Demarcation: The act of physically marking a boundary line on the ground.
Devolution: The transfer of power from a central government to regional or local governments within a country.