<Li> ^ While Sucre is the constitutional capital, La Paz is the seat of the government as member of the UCCI and the de facto capital . See below . </Li> <P> Bolivia (/ bəˈlɪviə / (listen); Spanish: (boˈliβja); Guarani: Mborivia (mboˈɾiʋja); Quechua: Buliwya (bʊlɪwja); Aymara: Wuliwya (wʊlɪwja)), officially known as the Plurinational State of Bolivia (Spanish: Estado Plurinacional de Bolivia), is a landlocked country located in western - central South America . The capital is Sucre while the seat of government is located in La Paz . The largest city and principal economic and financial center is Santa Cruz de la Sierra, located on the Llanos Orientales (Tropical lowlands) a mostly flat region in the East of Bolivia . </P> <P> It is constitutionally a unitary state, divided into nine departments . Its geography varies from the peaks of the Andes in the West, to the Eastern Lowlands, situated within the Amazon Basin . It is bordered to the north and east by Brazil, to the southeast by Paraguay, to the south by Argentina, to the southwest by Chile, and to the northwest by Peru . One - third of the country is within the Andean mountain range . With 1,098,581 km (424,164 sq mi) of area, Bolivia is the 5th largest country in South America and the 27th largest in the world . </P> <P> The country's population, estimated at 11 million, is multiethnic, including Amerindians, Mestizos, Europeans, Asians and Africans . The racial and social segregation that arose from Spanish colonialism has continued to the modern era . Spanish is the official and predominant language, although 36 indigenous languages also have official status, of which the most commonly spoken are Guarani, Aymara and Quechua languages . </P>

Which two countries are on the western border of bolivia