local color vs terrain

local color

noun
  • Aspects of a location that distinguish it from neighboring communities; the collective customs, mannerisms, fashions, artwork, accents or traditions of an area. 

terrain

noun
  • An area of land or the particular features of it. 

  • The surface of the earth; the ground. 

  • A single, distinctive rock formation; an area having a preponderance of a particular rock or group of rocks. 

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