In this presentation you can find a list of cities of Sri Lankan in an interactive app. below code demostrates gathering and filtering of data..

Original data file can be found at http://download.maxmind.com/download/worldcities/worldcitiespop.txt.gz. Download, Unzip it and save as a text file.

# data = read.table("worldcitiespop.txt")
# 
# head(data)
# levels(data)
# test = filter(datas, Country %like% 'l')
# 
# test = filter(datas, Country %like% 'lk')
# write.csv( test, "CitiesInSriLanks.csv")

## Assuming 'Longitude' and 'Latitude' are longitude and latitude, respectively

http://leafletjs.com/ http://stackoverflow.com/questions/31745525/leaflet-with-r-add-text-labels