Municipality of Sandanski is located in Southwestern Bulgaria and is the largest in Blagoevgrad district (1002 sq. km.). It consists of 54 settlements – the towns of Sandanski and Melnik and 52 villages. Its total population is 46113 people. It is located at the foothills of the magnificent Pirin Mountains, the bordering with Greece – Slavyanka Mountain, with Macedonia – Ograzhden and Maleshevska Mountains. Its territory covers a big part of the vast Sandanski – Petrich Valley and part of the picturesque valley of the Strouma River.

The resort of Sandanski (29 149 people) is the main administrative, cultural and economic center of the municipality. It is situated 220-240 m above sea level in the valley and at the two banks of Sandanska Bistritsa River.

Melnik Architectural Reserve is the smallest town in Bulgaria, found 22 km southeast from the town of Sandanski and at the southwestern foothills of the Pirin Mountains. It is situated at the heart of the Melnik Sand Pyramids, 437 m above sea level. The Melnik River, a left feeder of Strouma, passes through the small town.