Columbia subject headings:
Geopolitics--Río de la Plata Region (Argentina and Uruguay)
Jurisdiction, Territorial.
Martín García Island (Buenos Aires, Argentina)--History.
Río de la Plata Region (Argentina and Uruguay)--History.
Harvard subject headings:
Geopolitics--Rio de la Plata Watershed.
Jurisdiction, Territorial--Rio de la Plata Watershed.
Martín García Island (Buenos Aires, Argentina)--History.
Río de la Plata Watershed--History.
Princeton subject headings:
Argentina--Boundaries--Uruguay.
Brazil--Boundaries--Uruguay.
Brazil--Boundaries.
Martín García Island (Buenos Aires, Argentina)
Río de la Plata (Argentina and Uruguay)
Uruguay--Boundaries--Argentina.
Uruguay--Boundaries--Brazil.