Chile is among the longest north–south countries in the world. If one considers only mainland territory, Chile is unique within this group in its narrowness from east to west, with the other long north–south countries (including Brazil, Russia, Canada, and the United States, among others) all being wider from east to west by a factor of more than 10. Chile also claims of Antarctica as part of its territory (Chilean Antarctic Territory). However, this latter claim is suspended under the terms of the Antarctic Treaty, of which Chile is a signatory. It is the world's southernmost country that is geographically on the mainland.