downriver vs upriver

downriver

adv
  • Travelling in the direction of the river current. 

adj
  • Closer to the mouth of a river 

upriver

adv
  • Against the current. 

  • Towards the source of a river. 

adj
  • Towards the source of a river. 

How often have the words downriver and upriver occurred in a corpus of books? (source: Google Ngram Viewer )