Masalli is famous for its mineral springs, the most famous of which is Istisu (literal translation from Azerbaijani - "hot water"). This thermal spring breaks in several places at the Vilashchay river bank on the Dombal hillside at 1,650 meters above sea level. Water comes hot (about 69 degrees) from 90-250 m depth and is indicated for the treatment of many diseases. Today, there is a sanitarium "Fatima Zahra" and a variety of tourist facilities.

Istisu Settlement, Gariblar Village, Masalli District.