Not far from the actual fall, the stream created by the
Rinka Waterfall vanishes deep into the rocky ground. These waters gush
to the surface again on reaching the impermeable Werfen strata further down
the valley, from where the stream emerges as the Èrna ("Black") and flows
over dark sedimentary clays that impart it with its black tincture. This
stream then flows along a regulated riverbed to the lower end of the Logarska
Dolina Valley where it has its confluence with the Jezera stream (which
flows out from the neighbouring Matkov
Kot Valley) from which point it becomes the Savinja. This source has
been proclaimed as natural heritage.
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