Intertidal mudflat is the transitional area between the marine and terrestrial environments with muddy substratum. The 5-hectare intertidal mudflat in the Park was built to replicate the tidally inundated mudflats in the Deep Bay area, and designed primarily to attract migratory birds, especially waders. The mudflat was equipped with sluice gates to control the tidal flow, hence to control the level of water in the mudflat. The water level can be kept low in the mudflat to provide feeding site for waterbirds during high tides at the Deep Bay.