A ggplot2
geom for polygons with holes, called 'geom_polypath'.
Install from CRAN.
install.packages("ggpolypath")
Install the development version.
## install from Github
devtools::install_github("mdsumner/ggpolypath")
See the vignette for examples.
vignette("ggpolypath")
More examples, and more detail than you probably need can be found here: