is located in South-East Bulgaria
) on the southern slopes of Eastern Stara Planina. The average altitude ranges from 400 to 500 m. Forests occupy 354 sq.km. Center of munciaplity is village of Ruen
. The railway line Karnobat
and the road Bourgas
passes through the territory of the municipality. Most of the towns and villages are located along the Louda Kamchia and Hadzhijska rivers.
The villages located in flat areas develop vegetable and perennial plants growing. The areas planted with wine vines have increased over the past years. Much of the territory is occupied by oak, beech and coniferous forests that are home to deer, roe, wild boar, hare and all types of wild fowl.Rouen municipality
enjoys a very clean environment. Its territory is suitable for development of tourism. The municipality is visited by many tourists seeking its untouched nature, hunting and fishing.