Antigua and Barbuda:
none
Arctic Ocean:
some maritime disputes (see littoral states)
Argentina:
claims UK-administered Falkland Islands (Islas Malvinas);
claims UK-administered South Georgia and the South Sandwich Islands;
territorial claim in Antarctica partially overlaps British and
Chilean claims
Armenia:
Armenia supports ethnic Armenians in the Nagorno-Karabakh
region of Azerbaijan in the longstanding, separatist conflict
against the Azerbaijani Government; traditional demands regarding
former Armenian lands in Turkey have subsided
Aruba:
none
Ashmore and Cartier Islands:
none
Atlantic Ocean:
some maritime disputes (see littoral states)
Australia:
territorial claim in Antarctica (Australian Antarctic
Territory)
Austria:
minor disputes with Czech Republic and Slovenia over
nuclear power plants and post-World War II treatment of
German-speaking minorities
Azerbaijan:
Armenia supports ethnic Armenians in the
Nagorno-Karabakh region of Azerbaijan in the longstanding,
separatist conflict against the Azerbaijani Government; Caspian Sea
boundaries are not yet determined among Azerbaijan, Iran,
Kazakhstan, Russia, and Turkmenistan