Paraguay, officially the Republic of Paraguay, is a landlocked country located in the central region of South America. It borders Bolivia to the northwest and north, Brazil to the northeast and east, and Argentina to the southeast, south, and west. Paraguay has access to the Atlantic Ocean via the Paraná–Paraguay Waterway, a system of navigable channels shared by five countries. The country is governed as a unitary presidential republic composed of a capital district and seventeen departments. Its capital and largest city is Asunción. It dates its independence from Spain to 1811.