Barne Barton put-in (Plymouth)

The Hamoaze is the tidal, estuarine lower reach of the River Tamar, running between the river's confluence with the Lynher and Plymouth Sound, and forming part of the county boundary between Devon and Cornwall. Off Barne Barton the estuary is a wide, deep channel; downstream it narrows through the Narrows off Devonport Dockyard toward the Sound, and upstream it passes under the Tamar road bridge and Brunel's Royal Albert railway bridge toward Saltash.

The Devon bank here is dominated by HMNB Devonport, the largest naval base in Western Europe, with warships, submarines and auxiliaries berthed along the dockyard frontage. Immediately at Barne Barton is the former Royal Naval Armament Depot at Bull Point, a Crown establishment whose 19th-century magazine and workshop buildings survive and are listed. Weston Mill Lake nearby is a drying tidal inlet, and mudflats fringe this stretch of the estuary at low water.

The estuary is a Marine Protected Area combining the Plymouth Sound & Estuaries Special Area of Conservation, the Tamar Estuaries Complex Special Protection Area for overwintering waders including avocet and little egret, the Tamar Estuary Marine Conservation Zone, and the Tamar-Tavy Estuary Site of Special Scientific Interest. Seagrass beds grow in Plymouth Sound and the Tamar estuaries, and dolphins, porpoises and basking sharks are recorded in the wider waters.