Bodies of water define much of the physical boundaries of Clare. To the southeast is the River Shannon, Ireland’s longest river, and to the south is theShannon Estuary. The border to the northeast is defined by Lough Derg which is the third largest lake on Ireland. To the west is the Atlantic Ocean, and to the north is Galway Bay.
County Clare contains The Burren, a unique karst region, which contains rare flowers and fauna. At the western edge of The Burren, facing the Atlantic Ocean, are the Cliffs of Moher. The highest point in County Clare is Moylussa, 532m, in the Slieve Bernagh range in the east of the county.