Kiribati consists of 32 atolls and one solitary island (Banaba), extending into the eastern and western hemispheres, as well as the northern and southern hemispheres. It is the only country that is situated within all four hemispheres. In terms with its Exclusive economic zone, it straddles three geographic subregions; Banaba (Melanesian-Micronesian area), the Gilbert Islands (Micronesia) and the Line and Phoenix Islands (Polynesia). The groups of islands are: