[1] Lowestoft Ness, the most easterly point of Great Britain fell within its bounds.
Its border with Norfolk was formed by the River Waveney as it bends north on its final approaches to the sea, and Breydon Water.
The parishes of Belton with Browston, Bradwell, Burgh Castle and Hopton-on-Sea, historically in Suffolk, were moved to Great Yarmouth district in Norfolk in 1974 following the changes of the Local Government Act 1972.
It was separated from Lothingland by Oulton Broad and Lake Lothing through which the River Waveney formerly flowed to reach the sea.
If this is correct, the ford in question is presumably that where a stream enters the Hundred River in the grounds of Mutford Hall.