The eco tourist for sure know the name Blue stones (Sinite kamani). This is the natural park around Sliven, taking a part from Stara planina surface. Deeply indented relief, the richness of flora and fauna are suitable for for walking, cycling tourism, alpinism. The town famous with cultivating of peaches and textile producing also offers conditions for spa and balneo procedures. Last couple years the interest of investments in the area of Slivenski mineralni bani rased rapidly. They are good for prophylactic and treatment of stomachal, liver, urological, locomotorical diseases.