Inland Irish county, in Leinster, in the upper basins of the Liffey and Barrow, W. of Dublin and Wicklow; is level and fertile, with the great Bog of Allen in the N., and in the centre the Curragh, a grassy plain; agriculture is carried on in the river basins; the county town is Naas; other towns Maynooth, with the Roman Catholic theological college, and Kildare.