What does SOPI stand for? 

sopi

Shopi or Šopi (South Slavic: Шопи) is a regional term, used by a group of people in the Balkans. The areas traditionally inhabited by the Shopi or Šopi is called Shopluk or Šopluk (Шоплук), a mesoregion. Most of the region is located in Western Bulgaria, with smaller parts in Eastern Serbia and Eastern North Macedonia, where the borders of the three countries meet. In 2011 census in Serbia they are registered as a separate ethnicity and 142 people declared themselves as belonging to this ethnicity.The boundaries of the Shopluk in Bulgaria are a matter of debate, with the narrowest definition confining them only to the immediate surroundings of the City of Sofia, i.e., the Sofia Valley. The boundaries that are most commonly used overlap with the Bulgarian folklore and ethnographic regions and incorporate Central Western Bulgaria and the Bulgarian-populated areas in Serbia. It is only rarely that the Shopluk is meant to include Northwestern Bulgaria, which is the widest definition (and the one used here).

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