Zagyva
The Zagyva is a river in Hungary. This 179 km long river drains a basin of 5,677 km2. The source is near Salgótarján in Nógrád county. It flows through the towns of Bátonyterenye, Pásztó, Hatvan and Jászberény and flows into the Tisza at Szolnok. Average discharge at Szolnok is 9 m3/s. The Zagyva is the longest river in Hungary that has both its source and its confluence within the country's borders.
Etymology
The name comes from Slavic sadjati: to settle. *Sadzava: a river that carries many sediments, see i.e. Czech Sázava.In Hungarian, the name means 'muddled'.