national balneological resort at an altitude of 600 metres. There are more than 40 mineral springs in the town. The waters have a high content of sulfite compounds. These are used for the treatment of the locomotory system, gynecological and other kinds of diseases. The resort region includes several baths, balneological complexes and others. Kyustendil is located at the foot of the Osogovo mountain, on both banks of the Banshtica River and is a well-known centre of balneology and fruit growing. The town is 90 kilometres southwest of Sofia, 69 km northwest of Blagoevgrad and 22 km from the border with North Macedonia and Serbia. The fortress was built by the Romans. Thermae, basilicas, floor mosaics have been uncovered. Climate Kyustendil has a mediterranean climate with continental influence (because of the Struma river). The average annual temperature is around . The highest average temperatures are in July and August at and lowest in January at . The annual temperature range is .Summers are hot and long, winters are short and cool, spring comes early and stays steady after the first days of March and the autumn is long, warm and sunny while maintaining stable until the end of November. Rainfall is moderate – average , and there is snow on average 10–12 days in winter, although it may vary significantly. Due to moderately severe cloudy and hazy low (average 20 days per year) duration of sunshine is significant – about 2,300 hours per year. The second half of the summer and early autumn in the town are the sunniest of the year, and the cloud cover is mostly in the winter months. Humidity is moderate. It varies between 65 and 70%, and is relatively low in the summer months (especially in August). Kyustendil valley is characterized by low windiness, spring being the most windy season and autumn the most quiet. The average annual wind speed is . During the winter and spring months in the city appears warm and gusty wind "foehn", which causes sudden warming of time. The temperature regime is characterized by some special features. Winter temperature inversions occur, and in the summer as a result of overheating of the daily maximum air temperatures rise to . Summer nights are mild or warm with temperatures in the range of , although temperatures tend to drop below in the early mornings for about two hours. The lowest temperature in