The town of Hissarya is located in the centre of south Bulgaria in the outskirts of Sredna Gora Mountain. Having 22 different mineral springs, Hissarya is a world-famous health resort. The temperatures in the mineral water springs are ranging between 37 and 51 C.

The climate in Hissarya is transitional-continental with very mild winter. The snow stays 27 days per year and the spring comes early. The average temperature is 11.5 C. Autumn is warm and long lasting. Cloud coverage is low. The average annual humidity is moderate (70 %). Foggy weather is an exception. The wettest months are June and November. The maximum air humidity is 65-70 %, sunny days - 280 per year. The favorable climate conditions and the mineral water springs have attracted people to the region from ancient times. There is evidence for a Thracian settlement in Hissarya from IV millennium BC. Soon after the Roman Empire conquers these lands, the Roman Emperor Diocletian announces Hissarya for a town in the year 293 and renames it from Augusta to Diocletionapolis. The biggest heritage that the Romans have left us is a big fortress. The fortress had 44 turrets and was 11 m tall. There is a Roman Tomb in close proximity of the fortress.

Today Hissarya is a modern spa resort whose greatest asset consists in 22 mineral springs with a total debit of 4,000 l\min. and a temperature of 37-52 C, with a total exploitation flow of about 2,800 l/min. Hissarya’s mineral water is light, clear, colourless, flavourless and tasty. The radioactive emanation is 10-165 Em, pH - 7.6 - 9.02 and over 20 microelements. The acid content is 200 - 270 mg\l. It is slightly mineralised, hypo- and hyper-thermal, with a predominance of hydrocarbonic, sodium, sulphate and fluorine ions, as well as substantial amounts of radioactive gas characterized as slightly mineralised, hidrocarbonic-sulphate-sodium, with a high alkaline reaction (pH 8.3 to 9.02). Their temperature ranges between 27 Deg. C and 51 Deg. C and they vary in radioactivity, fluorine and metasilicic acid content. The water is mainly indicated for treatment of diseases of the kidneys and secretory system, liver and gall bladder, the digestive system and pancreas. Particularly good treatment results are achieved with comprehensive hydrotherapy and climatic cures, physiotherapy and kinesitherapy in cases of diseases of the kidneys and secretory system, such as a kidney stone, pyelonephritis, chronic nephritis and chronic renal insufficiency. Excellent therapeutic results have also been achieved with the use of mineral waters for the treatment of diseases of the liver, pancreas, gall bladder and bile ducts. A very good effect is exerted on cholelithiasis by means of subaqueous intestine baths. Special comprehensive balneotherapy is also applied in a number of diseases of the digestive system - gastric and duodenal ulcers, chronic gastritis, colitis, some accompanying conditions of locomotory system, the endocrine system and the metabolism. There is a museum collection of kidney stones that were expelled in Hissarya, there are more than 10,000 kidney stones in the collection – a true evidence of the effect of the mineral waters in Hissarya.

Except for being a balneological centre, Hissarya is a cultural place with many monuments and landmarks. The archeological museum in the town shows many different exponents from all the people that have inhabited the region: Thracian, Roman and Byzantine containers and utensils, statues, golden, silver and bronze coins and many different items. Other cultural monuments are: the Catholic church St Peter and Paul from 1882, The Orthodox church St Panteleimon from 1889, the church Uspenie Bogorodichno from 1883, the St Dimitar church from 1850, the Holy Mother of God temple in Momina Banya, etc.

Offering many different cultural sights and sanitariums, Hissarya is a favorite spa resort for many Bulgarian and foreign tourists.