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
Delvin River February to September. Trout fishing is usually catch a release; spinner reel fishing on one shore is allowed. Most trout are in the 2 pound range. Rivers of Ireland Delvin River The River Delvin () is a river of north County Dublin, about long and forming much of the Dublin-Meath boundary. It is largely under the responsibility of Fingal County Council, sometimes shared with Meath County Council. The Delvin rises north west of the village of Garristown, from which Garristown Stream joins it, and flows in a north easterly direction, forming much of the Dublin-Meath county boundary. It passes just