Much of the county is drained by its three major rivers – the River Liffey, the River Tolka in north Dublin, and the River Dodder in south Dublin. The Liffey, at in length, is the 8th longest river in Ireland, and rises near Tonduff in County Wicklow, reaching the Irish Sea at the Dublin Docklands. The Liffey cuts through the centre of Dublin city, and the resultant Northside–Southside divide is an often used social, economic and linguistic distinction. Notable inlets include the central Dublin Bay, Rogerstown Estuary, the estuary of the Broadmeadow and Killiney Bay, under Killiney Hill. Headlands include Howth Head, Drumanagh and the Portraine Shore. In terms of biodiversity, these estuarine and coastal regions are home to a wealth ecologically important areas. County Dublin contains 11 EU-designated Special Areas of Conservation (SACs) and 11 Special Protection Areas (SPAs).
Much of the county is drained by its three major rivers – the River Liffey the River Tolka in north Dublin and the River Dodder in south Dublin The Liffey at in length is the 8th longest river in Ireland and rises near Tonduff in County Wicklow reaching the Irish Sea at the Dublin Docklands The Liffey cuts through the centre of Dublin city and the resultant Northside–Southside divide is an often used social economic and linguistic distinction Notable inlets include the central Dublin Bay Rogerstown Estuary the estuary of the Broadmeadow and Killiney Bay under Killiney Hill Headlands include Howth Head Drumanagh and the Portraine Shore In terms of biodiversity these estuarine and coastal regions are home to a wealth ecologically important areas County Dublin contains 11 EU-designated Special Areas of Conservation (SACs) and 11 Special Protection Areas (SPAs)