Sandanski is a town and a recreation centre in south-western Bulgaria, part of Blagoevgrad Province. Named after the Bulgarian revolutionary Yane Sandanski, it is situated in Sandanski–Petrich Valley at the foot of Pirin Mountains, along the banks of Sandanska Bistritsa River. Sandanski is about 20 km away from Bulgaria-Greece border and 100 km away from Aegean sea.
The town has a convenient location, a mild to warm climate and relatively high concentration of thermal water springs, which all make it a popular destination for relaxation and recreation.
Wikipedia https://en.wikipedia.org/wiki/Sandanski
Coordinates 41°33'55.496" N 23°16'43.114" E