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county in the province of Leinster, southeastern Ireland. One of the smallest Irish counties, Carlow is bounded by Counties Kildare (north), Wicklow and Wexford (east), and Kilkenny and Laoighis (west). The town of Carlow is the county seat. In the east are the granitic mountains of the Leinster Chain, which are crossed by the River Slaney and flanked to the west by the River Barrow valley; west of the valley is the ridge of Old Loughlin bog. The intensively cultivated county is particularly suited for barley; wheat and sugar beets are other major crops. The railway from Dublin to Kilkenny and Waterford crosses the county.