How did glaciers help shape Ireland’s landscape?

Ireland’s landscape was profoundly transformed by at least two major glaciations, which are responsible for much of the country's scenic diversity.1

Glacial activity shaped the terrain in several key ways:

• Erosion and Landforms: In mountainous regions like the Macgillycuddy’s Reeks, strong glaciation carved out deep valleys, serrated ridges, and sharp peaks. Across the lowlands, the movement of ice sheets created drumlins—elongated, rounded hills composed of glacial till—which are found in large swarms that often disrupt local drainage and create marshy hollows.234
• Soil Formation: Much of Ireland's soil originated from "drift," the ice-scoured material transported and deposited by glaciers. These deposits, particularly those containing limestone, have significantly improved the quality of the land for agriculture, contrasting with the often infertile soils derived from older, underlying rocks.5
• Drainage Patterns: Glaciation played a critical role in establishing the country's main river valleys, such as those of the River Bann and the River Lagan, which have historically served as vital routeways.4