What is "ipel"

Ipeľ ( Slovak; ) or Ipoly ( Hungarian) ( German: Eipel, archaic Slovak: Jupoľ ) is a long river in Slovakia and Hungary, tributary to the river Danube. Its source is in central Slovakia in the Slovenské rudohorie Mountains. It flows south to the Hungarian border, and then southwest, west and again south along the border until it flows into the Danube near Szob.

Ipeľ flows through or makes border of Banská Bystrica and Nitra regions in Slovakia, and Nógrád and Pest counties in Hungary.