This photo has been taken at twin waterfalls in Erikli district. You can go there from Yalova within one hour by car. Actually it's very close to Istanbul. In order waterfall to be seen that silky, you should use very slow shutter speed. Therefore, I shot using ISO 100 and aperture of f/22. To have even slower speed, I attached my 3 stop ND (neutral density) filter. Finally shutter speed could be slow as 1.3 seconds. Of course, tripod has also been used to prevent camera shake at these levels of shutter speed.