South Dublin South Dublin South Dublin () is a county in Ireland, within the province of Leinster, and the Dublin Region, a successor to County Dublin, from which its name derives. South Dublin County Council is the local authority for the county. The county contains both dense suburbs of Dublin and stretches of unpopulated mountain. In 2011 it had a population of 278,749, making it the third most populous county in the state. South Dublin has an area of 222.74 square kilometres. It is bounded by Dublin City (15 km to the north east), the River Liffey (separating it from Fingal to
Transport in Dublin section, and four lanes each way between junctions on the Northern and Western sections. Transport Infrastructure Ireland also increased capacity at many of the motorway's busiest junctions by building triple-grade interchanges instead of the lower capacity roundabouts and crossroads that had been in place. The toll at the West-Link which caused huge tailbacks was demolished and replaced by a tag tolling system. This reduced tailbacks greatly. The M1, M2, M3, M4, M6, M7, M8, M9 and M11 motorways all serve the Greater Dublin Area. Dublin is surrounded by what have been termed by Dublin City Council as an inner and