Between the mouths of the Padamo and the Mavaca the Orinoco receives the Ocamo from the north, into which flows the Matacona river. At the source of this last river live the Guainare Indians, far less copper-colored or brown than others in this region. This tribe belongs to what missionaries call 'fair Indians' or Indios blancos. Near the mouth of the Ocamo travelers are shown a rock that is the marvel. It is granite passing into gneiss, characterized by its black mica, which forms little ramified veins. Spaniards call this rock Piedra Mapaya (Map Rock). I chipped off a bit.