downriver vs upriver

downriver

adv

  • Travelling in the direction of the river current. 

adj

  • Closer to the mouth of a river 

upriver

adj

  • Towards the source of a river. 

adv

  • Against the current. 

  • Towards the source of a river. 

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