Annexation

Antarctica

Apartheid

Balkanization

Border landscape

Boundary, Disputes (definitional, locational, operational, allocational)

Boundary, Origin (antecedent, subsequent, superimposed, relic)

Boundary, Process (definition, delimintation, demarcation)

Boundary, type (natural/physical, ethnographic/cultural, geometric)

Buffer state

Capital

Centrifugal

Centripetal

City-state

Colonialism

Confederation

Conference of Berlin (1884)

Core/Periphery

Decolonization

Devolution

Domino Theory

EEZ (Exclusive Economic Zone)

Electoral Regions

Enclave

Exclave

Ethnic Conflict

European Union

Federal

Forward Capital

Frontier

Geopolitics

Gerrymander

Global Commons

Immigrant State

International Organization

Iron Curtain

Irredentism

Landlocked

Mackinder's Heartland Theory