PENMAN-MAWR, a mountain in Caernarvonshire, 1400 feet high. It hangs perpendicularly over the sea, at so vast a height, that few spectators are able to look down the dreadful steep. On the side which is next the sea, there is a road cut out of the side of the rock, about six or seven feet wide, which winds up a steep ascent, and used to be defended on one side only by a slight wall, in some parts about a yard high, and in others by only a bank, that scarce rose a foot above the road. The sea was seen dashing its waves 40 fathoms below, with the mountain rising as much above the traveller's head. This dangerous road was a few years ago secured by a wall breast-high, to the building of which the city of Dublin largely contributed, it being in the high road to Holyhead.