Senate federal level. Similarly in Argentina, in addition to the Senate at federal level, eight of the country's provinces, Buenos Aires, Catamarca, Corrientes, Entre Ríos, Mendoza, Salta, San Luis (since 1987) and Santa Fe, have bicameral legislatures with a Senate. Córdoba and Tucumán changed to unicameral systems in 2001 and 2003 respectively. In Australia and Canada, only the upper house of the federal parliament is known as the Senate. All Australian states other than Queensland have an upper house known as a Legislative council. Several Canadian provinces also once had a Legislative Council, but these have all been abolished, the last
Provinces of South Korea administrative divisions with equal status: special autonomous province, special city, metropolitan city, and special autonomous city. A special autonomous province (, ) is a province with more autonomy over its economy and more powers are given to the provincial government. Jeju is the only special autonomous province, while Seoul is the only special city and Sejong is the only special autonomous city. Governors for the provinces and mayors for the special/metropolitan cities are elected every four years. Current governors and mayors are listed at List of governors of South Korea. South Korea claims five provinces on the territory controlled by