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Booterstown Nature Reserve is the only Bird Sanctuary in South Dublin Bay – Dublin Bay is an internationally important feeding and roosting area for ducks, geese and waders, and probably holds the highest concentration of wintering waterfowl of an Irish estuary. As part of the Dublin Bay area, Booterstown Marsh is an essential refuelling and resting spot for migrating birds and provides three main habitats ranging from freshwater to saltwater( Moorhen, Reed Bunting, Sedge Warbler, Teal, Snipe, Lapwing, Oystercatcher, Redshank, Dunlin, and Brent Geese).


Baldoyle Bay Nature Reserve, which extends from Howth’s West Pier to just below Portmarnock village, is of high conservation importance, with an internationally important population of Brent Geese and nationally important populations of a further seven species. The inner estuarine section is a Statutory Nature Reserve and is also designated as a wetland of international importance under the Ramsar Convention. The site is a candidate Special Area of Conservation under the E.U. Habitats Directive. Two rivers run into the estuary one of which is the Sluice River.


Northbull Island Nature Reserve is a low lying, dune covered sand spit in Dublin Bay off the coast of the city’s north side. As a National Nature reserve it is a paradise for birdwatchers and wildlife enthusiasts, and a good place for walking. It is adjacent to private golf courses The Royal Dublin and St Anne’s. Bull Island was created 200 years ago due to the construction of the north bull wall to Dublin Port. It continues to grow seaward and is a rare natural occurrence in Ireland. Its current size is 5km long by 1km wide.