I don't know the name of this waterfall and in fact I doubt it has one. The location is at the side of the A5 opposite the lake Llyn Ogwen. The area is however much more than rivers and lakes with some striking mountains. We have actually nicknamed this location Little Yosemite due to some striking rock formations that remind you of the National Park (but on a much smaller scale. Most times of year are good here but winter is the best for snow capped mountains.