National Blue Trail

The National Blue Trail (in Hungarian: Országos Kéktúra, Kéktúra or simply OKT) is a part of the Hungarian section of the European Long Distance Walking Route E4. The route starts atop the Irottkő Mountain (884 m) on the Austrian-Hungarian border then cuts across Hungary eventually ending 1,128 km later at the village of Hollóháza by the Hungarian-Slovakian border.