Northern Ireland | History, Population, Flag, Map, Capital, & Facts (2024)

Relief

Northern Ireland can be thought of topographically as a saucer centred on Lough (lake) Neagh, the upturned rim of which forms the highlands. Five of the six historic counties—Antrim, Down, Armagh, Tyrone, and Londonderry—meet at the lake, and each has a highland region on the saucer’s rim. To the north and east the mountains of Antrim (physiographically a plateau) tilt upward toward the coast. They reach an elevation of 1,817 feet (554 metres) at Trostan, with the plateau terminating in an impressive cliff coastline of basalts and chalk that is broken by a series of the glaciated valleys known as glens, which face Scotland and are rather isolated from the rest of Northern Ireland. The rounded landscape of drumlins—smooth, elongated mounds left by the melting ice of the final Pleistocene glaciation—in the southeast is punctuated by Slieve Croob, which rises to 1,745 feet (532 metres), and culminates in the Mourne Mountains, which reach an elevation of 2,789 feet (850 metres) at Slieve Donard (Northern Ireland’s highest point) within 2 miles (3 km) of the sea. This impressive landscape of granite peaks is bounded by Carlingford Lough to the south.

The scenery to the south of Lough Neagh is gentler, but the land rises to 1,886 feet (575 metres) in Slieve Gullion near the border with Ireland. West of Lough Neagh the land rises gently to the more rounded Sperrin Mountains; Sawel, at 2,224 feet (678 metres), is the highest of several hills over 2,000 feet (610 metres). The far southwest, the historic County Fermanagh, is focused geographically on the basin of Lough Erne, in a drumlin-strewn area ringed by hills more than 1,000 feet (300 metres) high.

Drainage

Much of the landscape of Northern Ireland is gentle, and in most low-lying areas it is covered with swarms of drumlins that have played havoc with the local drainage and are interspersed with marshy hollows. Glaciation also gave the land its main valleys: those of the River Bann (which drains Lough Neagh to the Atlantic Ocean) in the north, the River Blackwater in the southwest, and the River Lagan in the east. All these valleys have been important routeways, but none have been more important than the Lagan, penetrating from Belfast Lough to the very heart of Ulster.

Soils

Soils are varied. Although much glacially transported material covers the areas below 700 feet (215 metres) in elevation, the nature of the soil is predominantly influenced by the underlying parent rock. Brown earth soils, forming arable loams, are extensive and are derived from the ancient Silurian rocks of the southeast—some 420 million years old—and from the more recent basalts of the northeast. There are peaty gleys and podzols in the Sperrins, and the impeded drainage of much of the southwest gives rise to acidic brown soil. Peat soils are common, particularly in the hollows lying between the drumlins, and hill peat is widespread throughout Northern Ireland. Although it is of no great commercial value, peat traditionally has been a source of fuel for the peasant farmer and is still cut extensively.