Trnovo is a municipality of the city of Istočno Sarajevo located in Republika Srpska, an entity of Bosnia and Herzegovina. As of 2013, it has a population of 2,050 inhabitants.
It consists of roughly one third of the pre-war municipality of Trnovo. Roughly two thirds of the pre-war Trnovo municipality is now part of the Federation of Bosnia and Herzegovina entity.
Wikipedia https://en.wikipedia.org/wiki/Trnovo,_Republika_Srpska
Coordinates 43°39'55.737" N 18°26'47.444" E