Lough Derg is Ireland's third-largest lake and the broadest, most beautiful stretch of the River Shannon. Straddling the borders of County Clare, Tipperary and Galway, it runs for about 40 kilometres through a landscape of wooded hillsides, stone-walled fields and quiet lakeshore villages. The water is broad enough that on a grey morning you can mistake it for the sea, yet calm enough that a kayaker can cross it on a good day.
The lake has been at the heart of Irish history for well over a thousand years. This is the territory of the Dál Cais, the clan that produced Brian Boru, the High King who broke Viking power at Clontarf in 1014. His stronghold at Killaloe, at the lake's southern end, and the monastic island of Inis Cealtra — where monks were copying manuscripts while much of Europe was in turmoil — give the region a depth that goes far beyond its undeniable prettiness.
Today the lake draws sailors and cruisers following the Shannon Navigation, anglers after bream, perch and pike, and cyclists working their way around the Lough Derg Way. The villages that line the shore — Mountshannon and Whitegate on the Clare side, Dromineer and Garrykennedy on the Tipperary shore — are small and unhurried, the kind of places where the pub is the social centre and the boats outnumber the cars.