Michael travels across the two counties in south-west England.
His journey begins in North Devon under the shadow of England's highest sea cliff, the 1,000ft-tall Great Hangman, and finishes up on the stunning three-mile golden sands of Woolacombe.
Along the way, Michael is joined by Raynor Winn, whose bestselling book The Salt Path is based on her experiences of walking the South West Coast Path with her terminally-ill husband, Moth.
She tells of how it changed their lives, and offers tips and advice for Michael's journey ahead, and how he should prepare for the challenges, both physical and emotional.
Coastal Devon & Cornwall with Michael Portillo begins Wednesday 25th August at 8pm on Channel 5.