A tranquil river.
This is river Unica in Planina karst field, Slovenia; the penultimate apparition of a most wondrous river with seven (!) names.
It has just come out of Planina cave, meandering (and sometimes flooding) this karst field. It then flows into sinkholes at the end of the field to emerge finally as Ljubljanica.
A lovely and tranquil river that spends most of its time deep underground! :-)
Photo taken with Nikon 1 J1, lifted by a Royal 69 sled kite.