This was taken at Malham Cove in the Yorkshire Dales on a recent holiday in July.

Standing some 80 metres high and 300 metres wide and north of the mid craven fault, Malham Cove is a curved crag of carboniferous limestone formed after the last ice age. Meltwater, particularly from Malham Tarn, cut back the cove as it fell over the edge as a waterfall. This erosion took place more actively at the lip of the fall rather than at the sides, hence the curved shape. (http://www.malhamdale.org.uk)

Taken with Canon 400D 18-55lens at 18mm
Aperture f/9.0
Shutter 20 seconds
ISO 100
ND x 400 filter used to slow the shutter in daylight. and blur the motion of the sky and stream.