"Amazon"

 

Satellite photo of the mouths of the Amazon
Public DomainSatellite photo of the mouths of the Amazon

Map of the Amazon drainage basin
Permission Granted by Copyright Owner for Use on Book DrumMap of the Amazon drainage basin - Credit: Karl Musser
A reference to the greatest river -- by volume of water, by area of land drained, by length (although this is disputed in comparison with the Nile) and width -- in the world. The narrator is suggesting the wind is clearing a huge path between the clouds for the Dust Witch’s balloon.