calm blue lake with hills and forest in intense fall colors and reeds in the foreground

autumn balkan blue brown calm clear colorful colors country croatia destination fall foliage horizontal idyllic image intense lake lakes lakeshore lakeside landmark landscape marshgrass mirror national nobody orange outdoors park peaceeful plitivice plitvice red reeds reflect reflection scenery scenic season seasonal serene sightseeing travel trees turquoise unesco vibrant visit water wooden yellow