The republic of Ireland occupies the greater part of an island lying to the west of Great Britain, from which it is separated—at distances ranging from 11 to 120 miles (18 to 193 km)—by the North Channel, the Irish Sea, and St. George’s Channel. Located in the temperate zone between latitudes 51°30′ and 55°30′ N and longitudes 6°00′ and 10°30′ W—as far north as Labrador or British Columbia in Canada and as far west as the West African state of Liberia—it constitutes the westernmost outpost of the Atlantic fringe of the Eurasian landmass. Ireland, which, like Great Britain, once formed part of this landmass, lies on the European continental shelf, surrounded by seas that are generally less than 650 feet (200 metres) deep. The greatest distance from north to south in the island is 302 miles (486 km), and from east to west it is 171 miles (275 km).
The territory of the republic consists of a broad and undulating central plain underlain by limestone. This plain is ringed almost completely by coastal highlands, which vary considerably in geologic structure. The flatness of the central lowland—which lies for the most part between 200 and 400 feet (60 and 120 metres) above sea level—is relieved in many places by low hills between 600 and 1,000 feet (180 to 300 metres) in elevation. With many lakes, large bog areas, and low ridges, the lowland is very scenic. The principal mountain ranges are the Blue Stack Mountains in the north, the Wicklow Mountains in the east (topped by Lugnaquillia, at 3,039 feet [926 metres]),the Knockmealdown and Comeragh mountains in the south, the Macgillycuddy’s Reeks in the southwest, and the Twelve Pins in the west.
Carrantuohill, at 3,414 feet (1,041 metres) in the Macgillycuddy’s Reeks, is the highest point in the republic. In the west and southwest the wild and beautiful coast is heavily indented where the mountains of Donegal, Mayo, Galway, and Kerry thrust out into the Atlantic, separated by deep, wide-mouthed bays, some of which—Bantry Bay and Dingle Bay, for example—are, in fact, drowned river valleys.
The coastal mountain fringe illustrates the country’s complex geologic history. In the west and northwest as well as in the east, the mountains are composed mainly of granite. Old Red Sandstone predominates in the south, where the parallel folded mountain ridges trend east-west, separated by limestone river valleys. Ireland experienced at least two general glaciations—one covering most of the country and the other extending as far south as a line linking Limerick, Cashel, and Dublin—and the characteristic diversity of Irish scenery owes much to this glacial influence. The large areas of peat bog to be found throughout the country are a notable feature of the landscape. By contrast, the east coast is little indented, but most of the country’s trade passes through its ports because of their proximity to British and Continental markets. "Ireland" © Emmanuel BUCHOT, Encarta, Wikipedia
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