CAERVALLOUGH (CAER-VALLWCH), a township, in the parish of NORTHOP, Northop division of the hundred of COLESHILL, county of FLINT, 2 miles (W. by N.) from Northop, containing 860 inhabitants. There are lead mines in this township, which have been worked from a very remote period, but are now fast declining, on account of the low prices of ore. On an eminence, one thousand and twenty feet above the level of the sea, is a very extensive British fortress, the most perfect in North Wales, called Moel y Geer, or "the fortified hill," surrounded by a deep circular fosse, through which is an entrance on the western side. Within it, near the northern extremity, there is a small artificial mound, the summit of which commands the most extensive view in the county, embracing all the other British camps on the whole range of the Clwydian mountains to the west; the vales of Hope and Mold, as far as Wrexham, to the south; the estuaries of the Dee and Mersey, with the port of Liverpool to the north; and the port of Chester to the east. About three hundred paces north-westward from this camp is an extensive artificial mound, commanding the pass through the mountains, and doubtlessly intended as an outpost to Moel y Gaer.