Hillside and sheep in late evening sunlight at Penrhiw Isaf, Conwy during the volcanic ash cloud eruption period of the Icelandic volcano in April 2010. The land to the east of the Conwy Valley is more rolling than the west side. There are deep sided valleys caused by meltwater from the ice sheet at the end of the last Ice Age, like this at Penrhiw Isaf near Glan Conwy.