Saba is the smallest island of the Netherlands Antilles, located at. It consists largely of the dormant volcano, Mount Scenery (877 m), the highest point of the Kingdom of the Netherlands. Saba has a land area of 13 km² (5 sq. miles). At the 2001 Netherlands Antilles census, the population was 1,349 inhabitants, which means a population density of 104 inhabitants per km². In 2004 the population was estimated at 1,424 inhabitants. Its current major settlements include The Bottom, Windwardside, Hell's Gate and St. Johns. Despite the island's Dutch affiliation, English is the principal language spoken on the island and has been used in its school system since 1986. The Netherlands Antillean guilder is the official currency, but the U.S. dollar is accepted everywhere on the island. Saba is home to the Saba University School of Medicine, which was established by American expatriates in coordination with the Netherlands government. The school adds over 300 residents when classes are in session, and it is the prime educational attraction. A.M. Edwards Medical Center is the major provider of healthcare for local residents.