Rondônia is one of the 26 states of Brazil, located in the northern subdivision of the country (central-western part). 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 and southwest is Bolivia. Rondônia has a population of 1,755,000 as of 2014. It is the fifth least populated state. Its capital and largest city is Porto Velho. Full HD.