Starting from Parádfürdő and created alongside the Ilona stream, the nature trail presents the geological values of the Eastern Mátra Mountains and the memories of the former ore mining. On the 6.5-kilometre-long hiking trail, there are stations indicating the Etelka pit opened by Baron Orczy in 1780, the Timsós (Alum) quarry, the Szent István (King St. Stephen) csevice (aerated spring) well, the Ördöggátak (andesite vein intruded between the continental sandstone and the rhyolite tuff during the Miocene) and the Ilona valley waterfall pouring down the 8-10-metre-high cliff built up of pyroxene-andesite.

Source: https://www.gyongyos-matra.hu/termeszeti-ertekek-2/termeszeti-ertekek/ilona-volgyi-tanosveny/