Naantali are some important points of interest in the city, such as the Moomin World theme park on the island of Kailo. Naantali Spa Hotel, the largest spa in the Nordic countries, and the Naantali’s medieval convent stone church. The city's popularity as a tourist venue is highlighted by the fact that the official summer residence of the President of Finland, the Kultaranta estate, is located on Luonnonmaa. The archipelago sea boat traffic is handled by S/S Ukkopekka. Old steamship cruise Naantali-Turku-Naantali. Naantali hosts an international music festival every June, and the traditional Sleepyhead Day carnival in July. In addition to
Naantali tourism, the city's main industries are electricity production, oil refining, manufacturing, and services. The Port of Naantali is the third largest in Finland in terms of goods traffic, and the city is home to a power plant and an oil refinery owned by the government-controlled company Fortum and Neste. Naantali is twinned with: Naantali Naantali (; ) is a town in south-western Finland, known as one of the most important tourist centres of the country. The municipality has a population of (), and is located in the region of Southwest Finland, west of Turku. The town encompasses a land area