Simitli municipality is located in South-West Bulgaria, at a distance of 118 km to the south of Sofia in Blagoevgrad District (15 km from town of Blagoevgrad). It is situated along the middle course of the Strouma River, not far from the Oranovski gorge. An important factor for the development of the Municipality is the crossing of transport communication lines in it. It is crossed by the Sofia - Athens railway line and highway and the deviation to Razlog town and the Mesta River valley through the Predela pass. The four mountains - Rila, Pirin, Maleshevska and Vlahina outline the borders of the Municipality of Simitli. Mountainous and semi-mountainous relief prevails. The Municipality consists town of Simitli and 17 villages. In the central part of the Municipality six of its population centers are located close to each other along the Strouma River course, and the other five small villages are in the mountainous western part. Another six population centers are located to the east on the banks of mountain streams.
The trend in the development of Simitli Municipality is towards making it a tourism and balneology center. Remains of a medieval fortress with a tower, stone walls and parts of a road have been found in the vicinity of Kroupnik village. In the recesses of Vlahina Mountain the Troskovski Monastery is located. It was built earlier than the world-famous Rila Monastery and is a tourist attraction. Simitli Municipality is a balneology treatment center of local importance.