Hi there!
I would like to highlight the city limits (of Berlin, see example below), because you hardly recognise them. Do you have any ideas how to do this? Dashed, thicker lines in grey/black would be great.
library(ggplot2)
library(ggmap)
myLocation<-c(lon= 13.405057, lat = 52.528357)
myMap<-get_map(location=myLocation, source="google", maptype= "roadmap", crop=FALSE, language = "German", color="bw")
ggmap(myMap)
Could you please turn this into a self-contained reprex (short for reproducible example)? It will help us help you if we can be sure we're all working with/looking at the same stuff (and it takes care of rendering images for you, so we'll be able to see the maps!).
If you run into problems with access to your clipboard, you can specify an outfile for the reprex, and then copy and paste the contents into the forum.