coastlines              world coastlines from Natural Earth
countries               world country polygons from Natural Earth
map_units               world map_unit polygons from Natural Earth
rnaturalearthdata       rnaturalearthdata : World Vector Map Data from
                        Natural Earth Used in 'rnaturalearth'
sovereignty             world sovereignty polygons from Natural Earth
states                  state (admin level 1) polygons from Natural
                        Earth
tiny_countries          tiny countries points from Natural Earth
