It passes to the east of South Petherton and flows north through Thorney Moor and Muchelney Level and it is then joined by the Isle and Yeo ( Ivel ) rivers .
It enters Somerset at Haselbury Plucknett where it is joined by the Broad river .
Somerset passes to the east of South Petherton and flows north through Thorney Moor and Muchelney Level and Somerset is then joined by the Isle and Yeo ( Ivel ) rivers .
It enters Somerset at Haselbury Plucknett where it is joined by the Broad river .