On the sides of the River Nidd I found this area that the water was passing through an opening on a natural weir to get downstream. Being late Autumn many of the trees were shredding leaves and the use of a neutral density filter and a long exposure meant I was able to blur the passage of the leaves as they went through the gap.

The technical bit:
Location - Knaresborough, North Yorkshire
Camera - Nikon D800
Lens - Nikon PC-E Micro 45mm f/2.8D ED
Aperture - f11
Exposure - 6 seconds
ISO - 100