Trebnje (pronounced [ˈtɾeːbnjɛ] , German: Treffen) is a town in southeastern Slovenia. Trebnje lies on the Temenica River in the traditional region of Lower Carniola. The area was already settled in Antiquity. The modern settlement developed on the main regional road and railway line from Ljubljana to Novo Mesto. The old town center with the parish church stands slightly raised on the left bank of Temenica River, and the new part extends to the north from the railway line and the regional road toward Novo Mesto. Trebnje is the centre of the Municipality of Trebnje.