The National Blue Trail (in Hungarian: Országos Kéktúra, short: OKT) is a national trail in Hungary, for most of its length part of the European Long Distance Walking Route E4. The route starts atop the Írott-kő Mountain (884 m) on the Austrian-Hungarian border then leads across Hungary eventually ending 1,170 km later at the village of Hollóháza by the Hungarian-Slovakian border. (Interactive map). The name of the Kéktúra (Blue Trail) is a reference to the marking of the path itself: it is a horizontal blue stripe on a white rectangle. All segments of the trail are freely accessible to the public; no fees have to be paid or permits obtained, there is only one ferry to take over the Danube between Visegrád and Nagymaros where you have to purchase a ticket. Although to have an official completion, you have to purchase a stamping brochure from MTSZ, the organizer of the trail. More information...
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