Trbovlje is Slovenia's eleventh-largest town, located in the traditional province of Styria and acting as the seat of the Municipality of Trbovlj…Trbovlje is Slovenia's eleventh-largest town, located in the traditional province of Styria and acting as the seat of the Municipality of Trbovlje. A historically renowned mining town, Trbovlje is located in the valley of a minor left tributary of the Sava River in the Central Sava Valley in central-eastern Slovenia.