We reach the beginning of the Schiena dell’Asino path, a wonderful natural path that will take us up to an altitude of 2070 m a.s.l. The first part of the path develops uphill inside a magnificent pine forest then becomes almost flat and the wood gives way to expanses of volcanic ashes and Astragalus Siculus or Spino Santo, among its thorns we can observe and touch volcanic lapilli that sometimes have only a few It is a pioneer formation characterized by a typical pulvinus form that settles on the incoherent and permeable volcanic sands, it is an Etnean endemism that, thanks to its developed root system, stabilizes the incoherent substrates, facilitating other orophilic species many of the as endemic and exclusive of Etna, among these we remember the Viola Aetnensis. Once we reach the top of the path, a wonderful spectacle awaits us, the majestic and active crater of the Southeast and the immense Valle del Bove will frame us. Returning aboard the jeeps, proceed in the direction of one of the most famous lava flow caves of Etna and here, as only in Iceland, you are captivated by the charm that emanates from a dark and deep atrium. Equipped with helmets and torches we visit the lava tunnel. Return to the starting point.