Ronônia (pronounced [xõˈdõnia]) is a state in Brazil, located in the north-western part of the country. To the west is a short border with the state of Acre, to the north is the state of Amazonas, in the east is Mato Grosso, and in the south is Bolivia. Its capital is Porto Velho. The state was named after Candido Rondon. A boat ride on the Rio Madeira to appreciate the forest of centennial trees and the fauna of exotic birds is one of the best attractions of the State. Two thirds of its area is covered by the Amazon Rainforest. Other attractions are the Chapada dos Parecis and the Serra do Pacaás, a national park, and the capital, Pôrto Velho, plain and with few buildings.