The Dunajec is a river running through southern Poland. It is the right tributary of the Vistula River. It begins in Nowy Targ at the junction of two short mountain rivers, Czarny Dunajec and Biały Dunajec (Black and White Dunajec). Dunajec forms a border between Poland and Slovakia for 27 kilometers in the Pieniny Środkowe (Slovak: Centrálne Pieniny) range, east of the Czorsztyn reservoir.