Original: There are several Balti communities located in Pakistan's urban areas further south, notably in Lahore, Islamabad and in Karachi Script Balti is also the name of the Tibetan Balti script, which was replaced by the Persian script in the 17th century.
Simplified: There are several Balti communities in Pakistan's urban areas further south, that is in Lahore, Islamabad, in Karachi and other places.