Clare is north-west of the River Shannon covering a total area of 3,400 square kilometres (1,300 sq mi). Clare is the 7th largest of Ireland's 32 traditional counties in area and the 19th largest in terms of population. It is bordered by two counties in Munster and one county in Connacht: County Limerick to the south, County Tipperary to the east and County Galway to the north. Clare's nickname is the Banner County.
Bodies of water define much of the physical boundaries of Clare. To the south-east is the River Shannon, Ireland's longest river, and to the south is the Shannon Estuary. The border to the north-east is defined by Lough Dergwhich 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, 532 m (1,745 ft), in the Slieve Bernagh range in the east of the county.
The following islands lie off the coast of the county: