What is "shopi"

Shopi, ( South Slavic languages: Шопи, Šopi) is a regional term, used by a group of people in the Balkans, self-identifying as Bulgarians, Macedonians and Serbs. The areas traditionally inhabited by the Shopi is called Shopluk (Шоплук, Shopluk/srb. Šopluk), a mesoregion, roughly where Bulgaria, Serbia and Macedonia meet. In 2011 census in Serbia they are registered as separate ethnicity and 142 persons declared themselves as belonging to this ethnicity.