The bridge construction is likely to require dredging a 120 m wide trench along the route of the bridge to three metres below Chart Datum to allow piling vessel and barge access. Smaller dredged channels will also be needed to access concrete casting yards for the bridge elements. The quantity of dredged material to be removed has been provisionally estimated at 7,000,000 m³. There are numerous protected areas including several forested islands in the vicinity of the bridge crossing and areas of mangrove and peat swamps, especially along the southern side of the inner Brunei Bay. There are also areas of intertidal mudflat. The intertidal mudflats, mangroves and swamp areas attract migratory birds. There is a range of fishing activity within the bay.