This is the R code and shapefiles of the coniferous HUC-12 watersheds and their western US boundary for the publication, "Proportion of forest area burned at high-severity increases with increasing forest cover and connectivity in western US watersheds" 

Please see the publication "Proportion of forest area burned at high‑severity increases with increasing forest cover and connectivity in western US watersheds" for methods. 

Please read the included README.md file before use.