Lumps Fort is a disused fortification built on Portsea Island as part of the defences for the naval base at Portsmouth.

[1] The earliest reference is in the records of the Board of Ordnance in 1805 which mention "Lumps Fort-three 32-pounder guns".

It was constructed here to avoid the smog of the town of Portsmouth which would impede direct optical communications from Portsdown Hill.

In 1942, the Combined Operations Development Centre's Experimental Party, and soon after, the Royal Marine Boom Patrol Detachment, a specialist unit which also developed and trained in Sleeping Beauties and Boom Patrol Boats, began operations from the fort [latterly moving to Teignmouth, S.Devon].

[6] After the war, it was planted as a rose garden,[5] with the western part of the site becoming the Southsea Model Village[7] Adjacent to the site is the Canoe Lake, constructed from a large area of marshland, which was opened on 17 June 1886 and used as a boating lake.