Rondônia ro͝ondô´nyə [key], state (1996 pop. 1,132,692), 93,839 sq mi (243,043 sq km), NW Brazil, on the border with Bolivia. Pôrto Velho is the capital. Rain forests still cover much of the state, although by the 1980s deforestation had begun to emerge as a serious environmental problem in Rondônia.
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