Disputes - international:
Antarctic Treaty defers claims (see Antarctica entry), but
Argentina, Australia, Chile, France, NZ, Norway, and UK assert
claims (some overlapping), including the continental shelf in the
Southern Ocean; several states have expressed an interest in
extending those continental shelf claims under the United Nations
Convention on the Law of the Sea (LOS) to include undersea ridges;
the US and most other states do not recognize the land or maritime
claims of other states and have made no claims themselves (the US
and Russia have reserved the right to do so); no formal claims have
been made in the sector between 90 degrees west and 150 degrees west