It rises east of Thelnetham, very close to the source of the River Waveney - which flows eastwards while the Little Ouse flows west.
North of the village and along the river is the Blo' Norton and Thelnetham Fen Site of Special Scientific Interest, an important calcarous fen wetland site supporting a range of rare species such as black bog rush Schoenus nigricans and saw sedge Cladium mariscus plant species.