Surface waters on the territory of the Republic of Serbia, according to their importance for water management, are divided into waters of the first order and waters of the second order on the basis of established criteria, namely: position of watercourses in relation to the state border, size and characteristics of watersheds. . from the aspect of water use, water protection and protection against harmful effects of water. The decision on the inventory of first-order waters on the territory of the Republic of Serbia from 2010 determined 259 first-order waters.