Broadmeadow Water, also known as Malahide Estuary, is a coastal estuary located in Fingal, County Dublin, Ireland. It is a saltwater feature with a significant tidal influence. The estuary is sheltered by a railway embankment that dams the arches across its upper section, creating a distinct, more protected inner basin that has historically been used as a sailing nursery. Below this embankment, the estuary opens towards the open sea. A notable hazard for all watercraft is the very shoal sand bar at the entrance to the estuary, which can be difficult to negotiate. The surrounding area includes the coastal path between Malahide and Portmarnock, offering elevated views over the water. From the water, paddlers can see landmarks such as Robswalls Castle, a historic tower house overlooking the estuary. The aesthetic is characterized by the broad, tidal waters of the estuary with views across towards Portrane. The water quality of Malahide Estuary has been classified as moderate for transitional waters. There are specific seasonal regulations; for example, in the Dublin area, Broadmeadow Water is subject to fishing closures from October 15 to January 31.