Solomon Islands is an island nation that lies east of Papua New Guinea and consists of six major islands and over 900 smaller islands. The major part of the nation is the mountainous High islands of the Solomon Islands archipelago, which includes Choiseul, the Shortland Islands, the New Georgia Islands, Santa Isabel, the Russell Islands, the Florida Islands, Tulagi, Malaita, Maramasike, Ulawa, Owaraha (Santa Ana), Makira (San Cristobal), and the main island of Guadalcanal. Bougainville Island is the largest in the archipelago, while it is geographically part of the Solomon Islands archipelago, it is politically an autonomous region of Papua New Guinea. The Solomon Islands also includes isolated low-lying coral atolls and high islands including Sikaiana, Rennell Island, Bellona Island, the Santa Cruz Islands and the remote, tiny outliers, Tikopia, Anuta, and Fatutaka.