Cash is in the hole to the left of the waterfall Prskalo, in the valley of the river Nekudovo Kučajskim mountains in eastern Serbia. Prskalo is one of the most unusual natural phenomena on Kučaj, cone-shaped formations built by bigren deposits that accumulated during centuries of water, which runs the narrow canals at the top and plunges to the outermost edge.

source: http://www.freebiking.org/GPS/kesevi/prskalo.html