Malahide Bay is a coastal inlet on the Irish Sea in County Dublin, historically significant as a trading and fishing port. It forms part of the broader Malahide Estuary system, which includes the Broadmeadow River. The bay is characterized by its tidal nature, mixing with estuarine waters, and features a mix of sandy and muddy substrates in its shallower areas, with deeper channels leading out to the Irish Sea. The area is designated for its environmental importance, influencing both the fishing opportunities and the regulations that govern them.