The Rio de Janeiro Botanical Garden or Jardim Botânico is located at the Jardim Botânico district in the "Zona Sul" (South Zone) of Rio de Janeiro. The Botanical Garden shows the diversity of Brazilian and foreign flora. There are around 6,500 species (some endangered) distributed throughout an area of 54 hectares, and there are numerous greenhouses. The garden also houses monuments of historical, artistic and archaeological significance. There is an important research center, which includes the most complete library in the country specializing in botany with over 32,000 volumes.