Baldoyle Bay, 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. The Sluice River Marsh is a relatively intact freshwater marsh, a habitat that is now rare in Co Dublin.