The island of Upolu (1.125 sq km (434 sq mi)) is the most important island of Samoa, although the largest island is that of Savaii, Upolu is also the most populated with 140,000 inhabitants. Along the north coast of the island is the capital of Samoa, the town of Apia, the only city of the whole archipelago. The island is of volcanic origin and its interior is formed by gentle and not too high mountains, the highest peak is Mount Fito, in the center of the island, which reaches an altitude of 1.100 meters.