Tahiti (; ) is the largest island in the Windward group of French Polynesia; this overseas collectivity of the French Republic is sometimes referred to as an overseas country. The island is located in the archipelago of the Society Islands in the central Southern Pacific Ocean, and is divided into two parts: The bigger, northwestern part Tahiti Nui and the smaller, southeastern part Tahiti Iti. The island was formed from volcanic activity and is high and mountainous with surrounding coral reefs. The population is 183,645 inhabitants (2012 census), making it the most populous island of French Polynesia and accounting for 68.5% of its total population.