 The hundred is about twelve miles (19 km) in length and six miles (10 km) wide.It is bounded on the west by the borough of Bury St Edmunds and Thingoe Hundred, on the north and east by Blackbourn and Stow Hundreds, and on the south by Cosford and Babergh Hundreds.It is a fertile district with undulating terrain and watered by streams which rise within its limits and feeding the rivers Thet, Gipping, Lark and Brett.